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.

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Fifine K037B Wireless Microphone System with Headset Lapel Mic for Speaking

Product ID: 753298763

Details

Brand
FIFINE
Colour
black
Compatible devices
Headphone
Connectivity technology
Wireless
Connector type
1/4" TRS
Model name
wireless lapel

🎤Includes headset & lavalier mics for versatile use

📡20 UHF frequencies for interference-free clarity

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

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Description

🎙️ Own the room wirelessly—speak freely, connect effortlessly!

DUAL MIC FLEXIBILITY - Switch between discreet lavalier and secure headset mics tailored for any speaking scenario.
PLUG PLAY SIMPLICITY - Unique paired ID sync means setup is as easy as plugging in a wired mic—no tech headaches.
PRO GRADE COMPATIBILITY - Works flawlessly with mixers, PA systems, cameras, and smartphones for multi-platform use.
EFFORTLESS WIRELESS RANGE - Operate confidently up to 65 feet with zero static or dropouts—perfect for dynamic presentations.
SEAMLESS UHF CONNECTIVITY - Choose from 20 frequencies to avoid interference and keep your message crystal clear.

The Fifine K037B Wireless Microphone System delivers professional-grade UHF wireless audio with 20 selectable frequencies, ensuring interference-free sound up to 65 feet. It includes both a headset and lavalier microphone for versatile speaking styles, features an easy-to-read LCD for system monitoring, and offers seamless compatibility with mixers, PA speakers, cameras, and smartphones. Ideal for presentations, teaching, preaching, and content creation, this battery-powered system combines plug-and-play simplicity with robust performance.

Specifications

ASIN	B076F5W8Q5
Antenna Location	Publick Speaking / Presentation / Preaching / Recording
Audible Noise	58 Decibels
Audio Sensitivity	95 Decibels
Best Sellers Rank	588,865 in Stationery & Office Supplies ( See Top 100 in Stationery & Office Supplies ) 49,972 in Office Electronics
Box Contents	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
Brand Name	FIFINE
Colour	black
Compatible Devices	Headphone, Radio
Connectivity Technology	Wireless
Connector Type	1/4" TRS
Customer Reviews	4.1 4.1 out of 5 stars (3,496)
Enclosure Material	Metal
Frequency Range	0.05 khz 15 khz
Frequency Response	16 KHz
Hardware Platform	Camera, Smartphone
Impedance	1900 Ohms
Item Dimensions	6.8 x 16.2 x 20.2 centimetres
Item Highlight	Wireless Microphone set, Beltpack Transmitter and Receiver,for Teaching, Preaching
Item Type Name	Wireless Microphone System with Headset & Lavalier Lapel Mics,2pcs(receiver and transmitter)
Item Weight	9.9 Ounces
Manufacturer	Fifine
Manufacturer Part Number	ABCD170019
Microphone Form Factor	Lavalier
Model Name	wireless lapel microphone
Model Number	K037B
Number of Batteries	2 AAA batteries required.
Number of Channels	1
Number of Items	1
Number of Packs	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

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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.

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AED 768

Duties & taxes included

In stock

Sold byAmazon UAEDelivered 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 UAE.

Secure transaction

ProDesertcart PRO

Fast, free shipping, member pricing & priority support.

Join PRO →

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Anjali K.

The product quality is outstanding. Exactly what I needed for my work.

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