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: 82152731

Details

Brand
FIFINE
Color
Black
Compatible Devices
Amplifier
Connectivity Technology
Wireless
Connector Type
1/4" TRS
Model Name
wireless lapel

🎤Includes headset & lavalier mics for versatile use

📡20 UHF frequencies for interference-free signal

🔋Battery-powered with 40-65 ft wireless range

Details

Brand
FIFINE
Color
Black
Compatible Devices
Amplifier

Description

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

BROAD COMPATIBILITY - Works flawlessly with cameras, smartphones, PA systems, and mixers via included adapters.
DUAL MIC FLEXIBILITY - Switch between discreet lavalier or secure headset mics to match your speaking style and environment.
PRO GRADE AUDIO CLARITY - Metal collar clip and windscreen reduce noise, delivering professional sound for presentations and recordings.
EFFORTLESS WIRELESS SETUP - Unique paired ID sync means plug-and-play simplicity—wireless mic setup as easy as wired.
SEAMLESS MULTI FREQUENCY OPERATION - Choose from 20 UHF channels to avoid interference and ensure crystal-clear audio every time.

The FIFINE Wireless Microphone System K037B offers 20 selectable UHF frequencies for interference-free wireless audio up to 65 feet. It includes both a headset and lavalier microphone, paired with a bodypack transmitter and receiver featuring 1/4" and 3.5mm adapters for versatile compatibility with cameras, smartphones, and PA systems. Designed for easy plug-and-play use with clear LCD monitoring, this battery-powered system delivers professional-grade sound clarity ideal for teaching, preaching, presentations, and content creation.

Specifications

ASIN	B076F5W8Q5
Antenna Location	Indoor/Outdoor
Audible Noise	58 Decibels
Audio Sensitivity	95 Decibels
Best Sellers Rank	#8,858 in Musical Instruments ( See Top 100 in Musical Instruments ) #171 in Wireless Lavalier Microphones & Systems
Brand	FIFINE
Built-In Media	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
Color	Black
Compatible Devices	Amplifier, Camera, Smartphone, Speaker
Connectivity Technology	Wireless
Connector Type	1/4" TRS
Customer Reviews	4.1 out of 5 stars 3,610 Reviews
Enclosure Material	Metal
Frequency Range	565.0 MHz - 584.0 MHz
Frequency Response	15 KHz
Hardware Platform	Camera, Smartphone
Item Dimensions	2.68 x 6.38 x 7.95 inches
Item Type Name	Wireless Microphone System with Headset & Lavalier Lapel Mics,2pcs(receiver and transmitter)
Item Weight	9.9 Ounces
Manufacturer	FIFINE
Mfr 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
Recommended Uses For Product	Indoor/Outdoor
Signal-to-Noise Ratio	58 dB
Special Feature	Clip
UPC	728290254117
Unit Count	1.0 Count
Warranty Description	N/a.

Reviews

A**Y

7.07.2018

D**Y

11.06.2020

B**S

13.04.2020

T**N

5.12.2018

M**.

8.04.2019

S**N

13.04.2019

M**R

19.12.2019

T**N

19.02.2020

A**I

1.12.2022

R**A

9.12.2018

J**S

22.03.2026

K**A

8.11.2021

S**N

1.10.2019

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