What are the exact 20 frequencies on these units please. what is the mw output of the transmitters please.?

Frequency is 565 to 584 Power 10db/10MV

I have a sony srs xb20 speaker can i use your system if i use a 1/4 to 3/8 adapter to plug into the Sony unit? if not why not?

No, you can't. Because this receiver output is about the same level as a wired mic. It must be plugged into a 1/4'' speaker input designed for a mic connection. If your speaker has only 3.5mm line inputs which require a higher level signal than a mic provides, the mic will be not suitable to be used with it, even you add an adapter. The sound will be soft and hard to be heard.

Can I plug the receiver into my iPhone, audio mixer, or Mac to record the audio?

Sorry, it works with only audio mixer that has 1/4" mic jack. If you need a mic to use with Mac, we have the K031 (Asin: B074C125TN) USB wireless lav mic. But neither of them will work with iPhone.

can it be used for singing

It will be more suitable for speaking than singing. We would recommend the handheld mic K025(ASIN:B0795PNCBG) or K035(ASIN:B01MT6AAIC) for singing. All these mics need to work with speakers/amps that has 1/4'' mic input.

Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

Help Track order

Account Cart

Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

Help Track order

Account Cart

FIFINE Wireless Microphone System, Wireless Microphone set with Headset and Lavalier Lapel Mics, Beltpack Transmitter and Receiver,Ideal for Teaching, Preaching and Public Speaking Applications-K037B

FIFINE Wireless Microphone System, Wireless Microphone set with Headset and Lavalier Lapel Mics, Beltpack Transmitter and Receiver,Ideal for Teaching, Preaching and Public Speaking Applications-K037B

Product ID: 82152731

Details

Brand
FIFINE
Color
Black
Compatible Devices
Amplifier
Connectivity Technology
Wireless
Connector Type
1/4" TRS
Model Name
wireless lapel

🎤Dual mic set: headset + discreet lavalier

📡20 UHF frequencies for interference-free clarity

🔋40-65 ft wireless range with low-power alerts

C$5899

Duties & taxes included

In stock

Sold byAmazon NicaraguaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Nicaragua.

Secure transaction

Description

🎙️ Own the room wirelessly — clarity and freedom in one sleek system!

BROAD COMPATIBILITY - Works flawlessly with mixers, PA systems, cameras, and smartphones via included adapters.
DUAL MIC VERSATILITY - Switch effortlessly between a secure headset mic and a low-profile lavalier for any speaking style or setting.
PLUG PLAY SIMPLICITY - Unique paired ID sync means setup is as easy as plugging in a wired mic—no tech headaches.
PRO GRADE NOISE CONTROL - Metal collar clip and windscreen reduce plosives and wind noise for professional sound quality.
SEAMLESS MULTI FREQUENCY OPERATION - Choose from 20 UHF channels to avoid interference and keep your message crystal clear.

The FIFINE Wireless Microphone System K037B delivers professional-grade audio with 20 selectable UHF frequencies, a headset and lavalier mic combo, and a reliable 40-65 ft wireless range. Designed for educators, speakers, and content creators, it offers plug-and-play ease, broad device compatibility, and noise-reducing accessories to ensure your voice stands out in any environment.

Specifications

ASIN	B076F5W8Q5
Antenna Location	Publick Speaking / Presentation / Preaching / Recording
Audible Noise	58 Decibels
Audio Sensitivity	95 Decibels
Best Sellers Rank	#7,622 in Musical Instruments ( See Top 100 in Musical Instruments ) #140 in Wireless Lavalier Microphones & Systems #6,126 in Office Electronics Products
Brand	FIFINE
Built-In Media	Headset microphone, Clip-on Lavalier microphone, Body pack Transmitter, Receiver with 1/4'' Plug, Solid metal collar clip, Windscreens, 1/4'' to 1/8'' adapter-cable, 1/4'' to 1/8'' TRS adapter cable, Female 1/4'' to 1/8'' TRS adapter converter cord
Color	Black
Compatible Devices	Amplifier, Camera, Smartphone, Speaker
Connectivity Technology	Wireless
Connector Type	1/4" TRS
Customer Reviews	4.1 4.1 out of 5 stars (3,617)
Enclosure Material	Metal
Frequency Range	565.0 MHz - 584.0 MHz
Frequency Response	15 KHz
Hardware Platform	Camera, Smartphone
Impedance	32 Ohms
Item Dimensions	2.68 x 6.38 x 7.95 inches
Item Type Name	Wireless Microphone System with Headset & Lavalier Lapel Mics,2pcs(receiver and transmitter)
Item Weight	9.9 Ounces
Manufacturer	Fifine
Mfr Part Number	ABCD170019
Microphone Form Factor	Headset, Lavalier
Model Name	wireless lapel microphone
Model Number	K037B
Number of Batteries	2 AAA batteries required.
Number of Channels	1
Polar Pattern	Unidirectional
Power Source	Battery Powered
Signal-to-Noise Ratio	58 dB
Special Feature	Clip, Wireless
UPC	728290254117
Unit Count	1.0 Count
Warranty Description	N/a.

Common Questions

Are the products genuine and authentic?+

Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

How long does delivery take and is it reliable?+

Delivery times vary by destination country, typically ranging from 3-9 business days. Each order is fully trackable through our system. We handle all customs clearance and use reliable courier partners for last-mile delivery. You'll receive regular updates about your order status via email and our app.

What is Desertcart? Is it safe to order from?+

Desertcart is an international e-commerce platform operating since 2014. We securely process thousands of orders globally each day. Every product goes through our quality verification process before delivery, and we provide end-to-end order tracking, 24/7 customer support, and a comprehensive returns policy to ensure a safe shopping experience.

How is product pricing calculated?+

Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Anita G.

Good experience, but the tracking updates could be better.

2 months ago

Reema J.

Perfect platform for hard-to-find items. Delivery was prompt.

1 month ago

View all Trustpilot reviews

Shop Global, Save with Desertcart

Value for Money

Competitive prices on a vast range of products

Shop Globally

Serving millions of shoppers across more than 100 countries

Enhanced Protection

Trusted payment options loved by worldwide shoppers

Customer Assurance

Trusted payment options loved by worldwide shoppers.

Desertcart App

Shop on the go, anytime, anywhere.

C$5899

Duties & taxes included

In stock

Sold byAmazon NicaraguaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Nicaragua.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Neha S.

Excellent communication throughout the order process. Product is perfect.

2 weeks ago

Suresh K.

Very impressed with the quality and fast delivery. Will shop here again.

4 days ago

View all Trustpilot reviews