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

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

DUAL MIC VERSATILITY - Switch effortlessly between a secure headset mic for dynamic speakers and a discreet lavalier lapel mic for hands-free, low-profile use.
PLUG PLAY SIMPLICITY - Unique paired ID synchronization means setup is as easy as plugging in a wired mic—perfect for busy pros who value efficiency.
SMART POWER MONITORING - Stay in control with real-time battery status and low-battery warnings on the receiver’s LCD display—never get caught off guard mid-presentation.
UNIVERSAL COMPATIBILITY - Works seamlessly with mixers, PA systems, cameras, smartphones, and amplifiers via included adapters—your all-in-one wireless audio solution.
SEAMLESS WIRELESS FREEDOM - 20 selectable UHF frequencies ensure crystal-clear, drop-out free audio up to 65 feet—no more tangled cables or static interruptions.

The FIFINE Wireless Microphone System K037B delivers professional-grade wireless audio with 20 UHF frequencies, dual headset and lavalier mics, and smart battery monitoring. Designed for seamless setup and broad compatibility, it’s ideal for educators, speakers, content creators, and performers seeking reliable, crystal-clear sound without the hassle of cables.

Specifications

Special features	Wireless
Compatible devices	Amplifier, Camera, Smartphone, Speaker
Colour	Black
Included components	Headset microphone, Lavalier microphone,Transmitter, Receiver, Windscreens, 2 adapter-cables
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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