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
Radio
Connectivity technology
Wireless
Connector type
1/4" TRS
Model name
wireless lapel

🎤Dual mic options: headset & lavalier for versatile use

📡20 UHF frequencies for interference-free clarity

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

E£ 24095

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Sold byAmazon EGYPTDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🎙️ Elevate your voice, own the room—wireless freedom for the modern pro.

BROAD COMPATIBILITY - Works flawlessly with mixers, PA systems, cameras, and smartphones via included adapters—perfect for every professional setting from boardrooms to studios.
DUAL MIC VERSATILITY - Switch effortlessly between a secure headset mic for dynamic presentations and a discreet lavalier mic for polished, hands-free speaking.
PRO GRADE SOUND CONTROL - Metal collar clip and windscreen reduce plosives and wind noise, delivering crisp, professional audio that commands attention.
SEAMLESS WIRELESS FREEDOM - 20 selectable UHF frequencies ensure crystal-clear sound without dropouts, even in crowded signal environments.
EFFORTLESS SETUP MONITORING - Unique paired ID synchronization and an easy-to-read LCD display make setup a breeze and keep you informed on battery life and signal status.

The Fifine K037B Wireless Microphone System offers professional-grade UHF wireless technology with 20 frequency options, dual headset and lavalier microphones, and a reliable 40-65 ft range. Designed for seamless setup and broad compatibility, it’s ideal for speakers, educators, content creators, and performers seeking crystal-clear, hands-free audio with real-time system monitoring.

Specifications

ASIN	B076F5W8Q5
Antenna Location	Publick Speaking / Presentation / Preaching / Recording
Audible Noise	58 Decibels
Audio Sensitivity	95 Decibels
Best Sellers Rank	578,869 in Stationery & Office Supplies ( See Top 100 in Stationery & Office Supplies ) 49,098 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	Radio, Headphone
Connectivity Technology	Wireless
Connector Type	1/4" TRS
Customer Reviews	4.1 4.1 out of 5 stars (3,494)
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 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	Wireless, Clip
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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E£ 24095

Duties & taxes included

In stock

Sold byAmazon EGYPTDelivered 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 EGYPT.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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