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 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

Audio Sensitivity
95 Decibels
Brand
FIFINE
Color
Black
Compatible Devices
Amplifier
Connectivity Technology
Wireless
Connector Type
1/4" TRS

🎤Dual mic types: headset & lavalier for versatile use

📡20 UHF frequencies for interference-free signal

🔋Battery-powered with low-power LCD indicators

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€ 84.01

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Sold byAmazon PortugalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🎙️ Elevate your voice, ditch the wires, own the room.

DUAL MIC VERSATILITY - Choose between a discreet lavalier or secure headset mic, perfect for presentations, YouTube content, or dynamic public speaking.
PRO GRADE MONITORING - Stay in control with an easy-to-read LCD display showing system status and low battery alerts—no surprises during your big moment.
PLUG PLAY SIMPLICITY - Setup is as intuitive as plugging in a wired mic—unique paired ID sync means zero hassle, so you focus on your message, not tech.
UNIVERSAL COMPATIBILITY - Works seamlessly with cameras, mixers, PA systems, and smartphones via included adapters—your all-in-one audio solution.
SEAMLESS WIRELESS FREEDOM - Switch effortlessly among 20 UHF frequencies to avoid interference and maintain crystal-clear audio up to 65 feet away.

The FIFINE Wireless Microphone System K037B delivers professional-grade audio with 20 selectable UHF frequencies, dual microphone options (headset and lavalier), and a user-friendly LCD display for real-time monitoring. Designed for seamless compatibility with cameras, smartphones, and PA systems, it offers up to 65 feet of reliable wireless range. Ideal for millennial professionals in presentations, content creation, and public speaking, this system combines plug-and-play ease with versatile performance to keep you sounding sharp and connected.

Specifications

ASIN	B076F5W8Q5
Audible Noise	58 Decibels
Audio Sensitivity	95 Decibels
Best Sellers Rank	#6,992 in Musical Instruments ( See Top 100 in Musical Instruments ) #126 in Wireless Lavalier Microphones & Systems
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
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
UPC	728290254117
Unit Count	1.0 Count
Warranty Description	N/a.

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