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—because your voice deserves the spotlight!

DUAL MIC VERSATILITY - Switch between a secure headset mic for dynamic speakers or a discreet lavalier lapel mic for hands-free, low-profile presentations.
BUILT TO PERFORM LAST - Solid metal clips and windscreens reduce unwanted noise, while battery indicators and low-battery warnings keep you confidently powered through every session.
EFFORTLESS SETUP SYNC - Paired ID synchronization makes connecting your transmitter and receiver as easy as plugging in a wired mic—get on stage faster and stress-free.
PRO GRADE COMPATIBILITY - Works flawlessly with cameras, smartphones, mixers, and PA systems via included adapters—perfect for creators, educators, and speakers who demand flexibility.
SEAMLESS WIRELESS FREEDOM - 20 selectable UHF frequencies ensure crystal-clear, drop-out free audio up to 65 feet—no more static interruptions during your big moments.

The FIFINE Wireless Microphone System (K037B) delivers professional-grade audio with 20 UHF frequency options, dual headset and lavalier microphones, and seamless compatibility with cameras, smartphones, and PA systems. Designed for educators, speakers, and content creators, it offers easy setup, reliable 40-65 feet wireless range, and smart battery alerts to keep your presentations uninterrupted.

Specifications

Special Feature	Wireless
Compatible Devices	Camera, Smartphone, Amplifier
Colour	Black
Included Components	headset microphone and clip-on lavalier microphone body pack transmitter, receiver with 1/4" plug, solid metal collar clip and windscreen, female 1/4" to 1/8" trs adapter converter cord (for camera), 1/4" to 1/8" trrs adapter cable (for smartphone)
Polar Pattern	Unidirectional
Audio Sensitivity	95 Decibels
Item Weight	9.9 Ounces
Impedance	32 Ohm
Microphone Form Factor	Microphone System
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
Hardware Platform	Smartphone
Number of Channels	1
Frequency Response	20 KHz
Manufacturer	FIFINE
UPC	728290254117
Product Dimensions	6.8 x 16.2 x 20.2 cm; 280.66 g
Batteries	2 AA batteries required.
Item model number	K037B
Number of Strings	4
Item Weight	280 g
Country of Origin	China

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