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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Description

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

BROAD COMPATIBILITY - Works flawlessly with mixers, PA systems, cameras, and smartphones via included adapters—your all-in-one audio solution.
DUAL MIC VERSATILITY - Switch between discreet lavalier or secure headset mics tailored for dynamic presentations and active speaking.
PRO GRADE AUDIO CONTROL - Metal collar clip and windscreen reduce unwanted noise, ensuring your voice stands out in any environment.
EFFORTLESS SETUP WITH SMART SYNC - Unique paired ID synchronization means plug-and-play simplicity—wireless mic setup has never been easier.
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 robust 40-65 ft wireless range, and smart paired ID synchronization for effortless setup. Featuring both headset and lavalier microphones, it’s optimized for teaching, preaching, and public speaking, compatible with a wide range of devices including cameras and smartphones. Battery status indicators and noise-reducing accessories ensure uninterrupted, crystal-clear sound for every performance.

Specifications

Special features	Wireless
Compatible devices	Amplifier, Camera, Smartphone, Speaker
Colour	Black
Included components	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
Polar pattern	Unidirectional
Audio sensitivity	95 Decibels
Item weight	9.9 Ounces
Microphone form factor	Headset
Item dimensions L x W x H	6.8 x 16.2 x 20.2 centimeters
Power source	Battery Powered
Number of batteries	2 AA batteries required.
Material	Metal
Signal-to-noise ratio	58 dB
Number of channels	1
Frequency response	50 KHz
Manufacturer	FIFINE
UPC	728290254117
Item Weight	280 g
Product Dimensions	6.8 x 16.2 x 20.2 cm; 280.66 g
Batteries	2 AA batteries required.
Item model number	K037B
Color Name	Black
Number of Strings	4
Material Type	Metal
Size	Lapel+Headset-K037B
Battery type	NiMH

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