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

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

Product ID: 753298763

Details

Brand
FIFINE
Colour
black
Compatible devices
Headphone
Connectivity technology
Wireless
Connector type
XLR
Model name
wireless lapel

🎤Dual mic set: Headset + Lavalier for versatile use

📡20 UHF frequencies for interference-free clarity

🔋Battery status LCD for real-time power monitoring

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Description

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

DUAL MIC POWER DUO - Switch effortlessly between discreet lavalier and secure headset mics for any speaking style.
PLUG PLAY SIMPLICITY - Unique paired ID sync means setup is as easy as plugging in a wired mic—no tech headaches.
PRO GRADE COMPATIBILITY - Works flawlessly with mixers, PA systems, cameras, and smartphones via included adapters.
STAY POWERED STAY READY - Built-in LCD alerts keep you ahead of battery life, so you never miss a moment.
SEAMLESS WIRELESS FREEDOM - Cut the cords and move freely with up to 65 feet range and zero dropouts.

The FIFINE Wireless Microphone System K037B delivers professional-grade audio with 20 selectable UHF frequencies to prevent interference, dual microphone options (headset and lavalier) for versatile speaking scenarios, and a user-friendly LCD display for battery monitoring. Designed for seamless wireless operation up to 65 feet, it’s ideal for teaching, preaching, presentations, and content creation, compatible with a wide range of audio devices via included adapters.

Specifications

ASIN	B076F5W8Q5
Antenna Location	Speech, Video Conference
Audible Noise	58 Decibels
Audio Sensitivity	95 Decibels
Best Sellers Rank	78,508 in Musical Instruments & DJ ( See Top 100 in Musical Instruments & DJ ) 1,738 in Wireless Microphones & Receiver
Box Contents	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
Brand Name	FIFINE
Colour	black
Compatible Devices	Headphone, Radio
Connectivity Technology	Wireless
Connector Type	XLR
Customer Reviews	4.1 4.1 out of 5 stars (3,482)
Enclosure Material	Metal
Frequency Range	0.05 khz 15 khz
Frequency Response	16 KHz
Hardware Platform	Camera, Smartphone
Impedance	1900 Ohms
Item Dimensions	6.8 x 16.2 x 20.2 centimetres
Item Type Name	Wireless Microphone System with Headset & Lavalier Lapel Mics,2pcs(receiver and transmitter)
Item Weight	9.9 Ounces
Manufacturer	Fifine
Manufacturer Part Number	ABCD170019
Microphone Form Factor	Lavalier
Model Name	wireless lapel microphone
Model Number	K037B
Number of Batteries	2 AAA batteries required.
Number of Channels	1
Polar Pattern	Unidirectional
Power Source	Battery Powered
Signal-to-Noise Ratio	58 dB
Special Feature	Clip
UPC	728290254117
Unit Count	1.0 count

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Sold byAmazon South KoreaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Desertcart purchases this item on your behalf and handles shipping, customs, and support to South Korea.

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