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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Wireless microphone set-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 options: headset & lavalier for versatile use

📡20 UHF frequencies for interference-free clarity

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

NZ$149

Duties & taxes included

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Sold byAmazon New ZealandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🎙️ Own the room wirelessly—speak up, stand out, and never miss a beat!

BROAD COMPATIBILITY - Plug into mixers, PA systems, cameras, or smartphones with included adapters—your all-in-one audio solution for any professional setting.
DUAL MIC VERSATILITY - Switch effortlessly between a discreet lavalier and a secure headset mic—perfect for dynamic presentations or active performances.
PRO GRADE NOISE REDUCTION - Metal collar clip and windscreen minimize plosives and breath sounds, delivering polished, studio-quality audio every time.
SEAMLESS WIRELESS FREEDOM - 20 selectable UHF frequencies ensure crystal-clear sound without dropouts, keeping you in control of every word.
EFFORTLESS SETUP MONITORING - Unique paired ID sync and an intuitive LCD display make setup a breeze and keep you informed with real-time battery 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 speakers, educators, and content creators, it features easy setup with paired ID synchronization, an LCD display for battery and signal monitoring, and broad compatibility with cameras, smartphones, and PA systems. Its metal build and noise-reducing accessories ensure clear, interference-free audio for presentations, preaching, and recording.

Specifications

ASIN	B076F5W8Q5
Antenna Location	Publick Speaking / Presentation / Preaching / Recording
Audible Noise	58 db
Audio Sensitivity	95 db
Best Sellers Rank	#6,152 in Musical Instruments ( See Top 100 in Musical Instruments ) #123 in Wireless Lavalier Microphones & Systems #6,136 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 out of 5 stars 3,627 Reviews
Enclosure Material	Metal
Frequency Range	565.0 MHz - 584.0 MHz
Frequency Response	15 KHz
Hardware Platform	Camera, Smartphone
Impedance	32 ohm
Item Dimensions	2.68 x 6.38 x 7.95 inches
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
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
Number of Items	1
Polar Pattern	Unidirectional
Power Source	Battery Powered
Recommended Uses For Product	Publick Speaking / Presentation / Preaching / Recording
Signal-to-Noise Ratio	58 db
Special Feature	Clip, Wireless
UPC	728290254117
Unit Count	1 Count
Warranty Description	N/a.

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