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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🎙️ Own the stage wirelessly — crystal-clear sound, zero hassle!

DUAL MIC FLEXIBILITY - Includes both a secure headset mic for active speakers and a discreet lavalier mic for hands-free convenience.
SMART POWER MANAGEMENT - Receiver features battery condition indicators and low-battery warnings to keep you performing uninterrupted.
EFFORTLESS SETUP SYNC - Unique paired ID synchronization makes wireless mic setup as simple as plugging in a wired one.
PRO GRADE COMPATIBILITY - Works flawlessly with mixers, PA systems, cameras, and smartphones via included adapters.
SEAMLESS SIGNAL MASTERY - 20 selectable UHF frequencies ensure crystal-clear, drop-out free audio up to 65 feet away.

The FIFINE Wireless Microphone System K037B delivers professional-grade UHF wireless audio with 20 frequency options, dual microphone styles (headset and lavalier), and seamless compatibility with a wide range of audio devices. Designed for educators, speakers, and content creators, it offers easy setup, reliable 40-65 feet range, and smart battery alerts to keep your voice heard clearly and confidently.

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Power Source	Corded Electric,Battery Powered
Number of Batteries	2 AA batteries required.
Signal-to-Noise Ratio	58 dB
Frequency Range	565.0 MHz - 584.0 MHz
Frequency Response	15 KHz
Audible Noise	58 dB
Hardware Platform	Camera, Smartphone
Number of Channels	1
Polar Pattern	Unidirectional
Audio Sensitivity	95 dB
Microphone Form Factor	Lavalier, Headset
Connectivity Technology	Wireless
Connector Type	3.5 mm Jack
Special Features	Wireless, 3.5mm jack
Compatible Devices	Camera, Amplifier, Smartphone, Speaker
Item Weight	9.92 ounces
Item Dimensions	2.68 x 6.38 x 7.95 inches
Material Type	Metal
Color	black

FIFINEWireless Microphone System, Wireless Microphone set with Headset and Lavalier Lapel Mics, Beltpack Transmitter and Receiver,Ideal for Teaching, Preaching and Public Speaking Applications-K037B

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