FIFINE K037B Wireless System with Lapel Mic and Headset for Speaker, C

FIFINE K037B Wireless System with Lapel Mic and Headset for Speaker, Camera, Android and iPhone

2 sold in last 8 hours
An external speaker with 1/4’’ (6.35mm) jack is NECESSARY
Being compatible with Speaker, Mobile, Camera.
Note: K037B does NOT work with computer. But K031B works.
Much more easier for gig/video filming on Camera/Recorder.
Lapel mic hided under your clothing ensure clarity for speech/video
light-weight head-worn mic fits firmly during Yoga and high-intensity aerobics.
10% OFF CODE: FifineMic10

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What's Included

  • A FIFINE K037B transmitter (back-pack)
  • A lapel mic & a head-worn mic (NO built-in amplifier, an external speaker is NECESSARY!) 
  • A 1/4" output connector receiver 
  • A 1/4" female to 1/8" male TRS (three black loops) adapter for camera
  • A 1/4" female to 1/8" male TRRS (four black loops) adapter for smartphone


Preparation for a gig or video filming becomes much easier 

  • A battery-powered system provides the greatest convenience for outdoor use.
  • Even the most generic AA battery(*2) for the back-pack transmitter and AAA ones(*2) for the receiver can last for 4 hours.
  • The system is pre-paired. Just remove from the box, plug into a camera/digital recorder via the included adapter or hook up directly with a PA speaker, amplifier, mixer (any device that allows 1/4" input) for a live event. 
  • For web conferencing through smartphones or computers, please see a better-suited model FIFINE K031B.  

Versatility cannot be beat

  • The light-weight head-worn mic fits firmly, making it possible to get quality sound for Yoga tutorial and even high-intensity aerobics;
  • The clip-on mic is ideal for presentation, YouTube videos. Your audience will not notice the hidden mic under your clothing but will be impressed by its clear sound!
  • In-born high sensitivity ensures good clarity. Using less gain of the speaker, camera, or phone provides more natural sound. Break free from carrying around a bulky DSLR pre-amp or raising speaker volume to distortion level.
  • The cardioid pattern does an excellent job of reducing noise, especially background sound. Let the audience hear you with good clarity!

Great features for outdoor use

  • The easy-to-read transmitter LCD display shows battery life and the current frequency channel. 
  • The receiver indicator conveys info of power and wireless connection (solid red - paired; blinking green- power runs low and failed to pair). 
  • Both features enable your quick response for changing fresh batteries or new frequency, to eliminate cutout or dropout.
  • UHF (Ultra High Frequency) is more penetrable and powerful, therefore a better choice for using in built-up areas. The wireless range is 45-60 feet even in the face of obstacles. 
  • 20 frequency channels ensure conflict-free performance in a less than perfect environment. 

What's the point of 20 channel

  1. When experiencing interference, click the button on top of the transmitter to find the best-suited channel. 
  2. Multiple sets of K037B can be utilized concurrently for a large group interview (will need multiple input jacks on speaker or mixer to plug in receivers). 


Frequency Band UHF 565-584MHz
Type Condenser
Polar Pattern Cardioid 
Frequency Response 50-16kHz
Power Supply

Transmitter: 2 AA Batteries  

Receiver: 2 AAA Batteries

Output Connection 1/4" TS connector (1/4" to 1/8" TRS adapter)
Shipping Weight 0.8 kg


*For self troubleshoot and tutorial video, check out more at the K037B technical support page

*For more info about technical aspects or email support, feel free to click this link Contact Us. 

Customer Reviews

Based on 17 reviews
Super surprised

I really like this product, I really was not expecting the power and clarity of this mic system. I use it for street busking and I’m really happy that I’ve chosen this product. I recommend this product highly…

Jonathan Burke
Great for Beginners and Indoor Vloggers

4/5 because it will require some post production work to make the audio clear but besides that it is a great microphone overall especially for new creators. I would recommend this mic to someone who is reviewing, vlogging or streaming indoors.

Dan Earl
A Solid Budget-Friendly Wireless Kit

For the price, you get a good quality wireless system.
I actually had the opportunity to test and review the system, and was genuinely surprised.
It's easy to use and good for seminars, church services, speaking engagements, etc.
You can check a more in-depth review I made on youtube if you're interested:

Scott Wheeler
pretty impressed with how little background noise it picks up

I tested sound quality walking around the room while completing random tasks and I'm actually pretty impressed with how little background noise it picks up without any need to digitally alter the recording after the fact. I got rechargeable batteries to use with it, and they seem to work fine, but I've not tested drain. Highly recommended!

Bill Davidson
80 ft of reception with no issues

Awesome. Fantastic, definetly the bang for the buck. Works well out of the box. Easy set up and sounds great. I've used them for two events so far so good, and easily 80 ft of reception with no issues. I also have high dollar Shure mics. This product is better in my opinion. No feed back when using with PA speaker. I like them so much I may order another.

Customer Reviews

Based on 36 reviews Write a review

K037B Order & Shipping Policy

Q: What if I want to cancel the order right after payment?
A: Please contact us immediately if you would like to make changes to your order.

Q: Do you have international shipping?
A: Sorry, no. Products on FIFINE website are not available for global shipping. Delivery covers UK, CA and US (APO/FPO address is not included). For customers who live outside these regions, you can check out on FIFINE AliExpress Store.
Address of the US warehouses: 17531 Railroad St., Unit A, City of Industry, CA, 91748 United State
Address of the CA warehouses: 450 Derwent PL, Delta, BC V3M 5Y9 Canada
Address of the UK warehouses: Plot 1, Lyons Park, Lyons Dr, Coventry, West Midlands CV5 9PF United Kingdom

Q: When will my order ship?
A: We process your order as soon as we receive it. And because of current situation, the processing time could take up to ONE business day, which is not added up to the shipping time.

Q: What if I provide the wrong/I want to change the shipping address?
If you find out the incorrectness or want to make changes before receiving shipping confirmation notification. Please message us as soon as possible so that we can correct the address or cancel the order. We are available at email: or Facebook messenger:
If the package has already been shipped, we will message you with the carrier info as soon as possible. Then you can contact them to relocate a correct address. If it can not be changed, we have to wait till the package being sent back to proceed a refund. And if it is not returned to sender successfully, we have no responsibility for issuing a refund or replacing the package.

Q: When can I expect my package to arrive?
1. If it is a pre-order or back-order that is in stock, your package will be shipped first.
2. Delivery takes 4-7 days (based on your location), which counts from the day when your order is processed. Shipping cost is free when your order weighs below 1.51 kg.
3. If it is emergent order that needs to be delivered on a specific date, please contact us before placing the order.

Q: When will I receive my shipment tracking number?
A: You will receive a notification email about the tracking information once your order leaves warehouse that is close to your location.

Q: What if tracking info indicates the package was received but I haven't actually receive it?
First off, please wait for one more business days, tracking info update could be ahead of the actual delivery.
Next, if you still haven't received package, please call and email the local post office. They will have more info than we can see online.
At last, when post office is not able to help find the package, you should send us the screenshots of communication with post office as evidence for us to file a complaint. With a response from Post Office through your contact, confirming that package is missing, we will do a refund on the product price.

Return & Refund Policy

Q: What is your return policy?
A: FIFINE MICROPHONE offers Free Return within 30 days, counting from the date when the tracking info shows delivered.
But it does not cover bulk purchase (more than three), intact item, item ordered by mistake. If you wish to return a product, please contact us.

Q: How do I request a return?
A: Please follow the steps below to return a product:
1. Contacted our email at with your order number and the reason for return (Any product shipped to us without a return authorization will be returned to the customer at his or her expense).
2. We will email you back to confirm the product condition. Custoemr will have responsiblity to help provide the info (pictures and recording) we required. Then we will give instructions for returning and a return number.
3. Ship your unused product in its original packaging to the address identified in our email.
4. Note: Return shipping fee is covered by FIFINE only if returns are for defective products, products that were not described accurately, or incorrect orders. Whether a product is defective depends the info that customer provides (pictures and recording).

"Return Terms"

Please be sure to use the original box, and the shipping carton and its packing material to ship the item back (the item is returned in the same condition as it was when shipped).
You are responsible for shipping the products back to us.If you are shipping an item over $75, you should consider using a trackable shipping service or purchasing shipping insurance. We don’t guarantee that we will receive your returned item.

Q: After I have returned a product, when will I see the refund in my account?
A: After receiving and examining your returned product(s), your refund will appear in your account within 3 to 5 business days. Please be aware that the refund will depend on the policies of PayPal that was used for payment.

Other Terms and Conditions

"Bulk Purchase Return"

If buyer bought more than THREE products at a time, any one of them is defective, we will provide the free replacement.
But if buyer decides to return them all, we will charge a restocking fee of 30% of the order total. And buyer is responsible for the shipment back to FIFINE local factory.


Once package has been shipped out, order cancellation is not possible. When product arrives, buyers are responsible for arranging return shipping and covering the cost by themselves and emailing us back with tracking number. If buyer decides to refuse package instead, we will charge a restocking fee of 30% of the order total.
Notice: Refund of "refuse-to-receive" item does not cover the origianl shipping fee, That means in this case, we will send back the payment of only the product listed price.

"Intact Items"

An intact item is one that its package has been opened and it works without a problem. If you want to return an intact product, the return shipping cost shall be covered on customer side. And we will deduct the original shipping fee from the refund total.

"Defective Items"

A defective item is one that is inoperable but has no apparent damage. If you receive a defective product, please contact our email for assistance.
Notice: Whether a product is defective depends the info that customer provides (pictures and recording).

"Damaged Items"

If the order arrives at you with obvious shipping damage, please refuse the delivery and email us with your order number. If you have accepted it, please save all packaging material and paperwork for the order and also email us for instructions.
If you dispose of packaging material, you jeopardize our chances of making a claim, and you may not receive the return.

"Limits of Responsibility"

We take no responsibility for user-initiated damage and/or loss of parts incurred during operation or use of the product. Though you still can email us for assistance on repairing or replacing components.

"Price and/or Description Changes"

All prices, pictures, and descriptions on this website are subject to change. We maintain no responsibility for inadvertent errors. When you place your order with us, you agree to the price and terms indicated on this website. Price differences related to future or past prices in FIFINE MICROPHONE store are not refundable.
Notice: We are sorry that the price fluctation during pandemic is not refundable.

"Errors on FIFINE MICROPHONE website"

Prices and availability of products are also subject to change without notice. Errors will be corrected where and when discovered. We reserve the right to revoke any stated offer, cancel orders, and to correct any errors, inaccuracies or omissions in any stated offer or price, including after an order has been submitted and whether or not the order has been confirmed and your payment processed. If your payment has already been processed for the purchase when your order is canceled, we will issue an immediate refund.

"For product FAQs, please turn to the K037B Technical Support Page"

K037B FAQs

Question 1: Would I be able to use a handheld mic with the same reciver?
Answer: Sorry, no. One receiver will pick up audio signal from single one microphone. Even you use the Fifine handheld mic, it will not sync with the same receiver.

Question 2: Is this mic good to teach fitness classes?
Answer: Yes, just need to plug into a speaker with 1/4" mic jack to output the sound.

Question 3: I am a teacher and need a portable speaker to move around with. Do you have suggestions on what goes well with this product?
Answer: It will also depend on how large the venue is. In a small room for around 10-20 people, the ION speaker that is with 1/4" mic jack (particularly the ION Audio Tailgater iPA77), or the Fender Squier sp10 amplifier will get the job done perfectly.

Question 4: Would I be able to use this system with a group of 20 kids for a theater production? Each would have his/her own set.
Answer: I am afraid that you can't do that. Even though there are 20 selectable frequencies, we recommend to increase/decrease at least 3-4 MHz different from another one. If you set 1 MHz differ from another one, it's easy to cause interference.

Question 5: How far the range you can go while still retaining good signal?
Answer: The working range is up to 50 feet.

Question 6: What kind of battery they used?
Answer: The bodypack transmitter uses 2 AA batteries and receiver (the part plugs into the speaker) uses 2 AAA batteries. We recommend to use 1.5v alkaline batteries for both devices.

FIFINE K037B Wireless System with Lapel Mic and Headset for Speaker, Camera, Android and iPhone
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