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 K037B Wireless Microphone System with Headset Lapel Mic for Speaking

Product ID: 256415863

Details

Brand
FIFINE
Connectivity technology
TRS/TRRS
Connector type
1/4" TRS
Model name
wireless lapel
Recommended uses for product
Speech Video

🎤Dual mic set: headset + lavalier for versatile hands-free use

📶20 UHF frequencies for interference-free use

🔋Receiver battery indicators with low-battery alerts

HK$552

Duties & taxes included

In stock

Sold byAmazon Hong KongDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🎙️ Own the stage wirelessly — sound flawless, look effortless!

DUAL MIC VERSATILITY - Switch effortlessly between a secure headset mic and discreet lavalier for any speaking or recording scenario.
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, cameras, smartphones, and PA systems via included adapters.
STAY POWERED STAY READY - Real-time battery status and low-battery warnings keep your performance uninterrupted.
SEAMLESS WIRELESS FREEDOM - 20 selectable UHF frequencies ensure crystal-clear, drop-out free audio up to 65 feet.

The FIFINE K037B Wireless Microphone System delivers professional-grade audio with 20 UHF frequency options for interference-free transmission up to 65 feet. Featuring both a secure headset and a low-profile lavalier mic, it offers versatile hands-free use ideal for speakers, performers, and content creators. Real-time battery monitoring and easy plug-and-play setup ensure uninterrupted, hassle-free operation. Compatible with a wide range of devices including cameras, smartphones, and PA systems, this metal-encased system is optimized for presentations, teaching, and live streaming.

Specifications

ASIN	B076F5W8Q5
Antenna Location	Speech, Video Conference
Audible Noise	58 Decibels
Audio Sensitivity	95 Decibels
Brand	FIFINE
Built-In Media	Headset microphone, Lavalier microphone,Transmitter, Receiver, Windscreens, 2 adapter-cables
Color	Black
Compatible Devices	Amplifier, Camera, Smartphone, Speaker
Connectivity Technology	TRS/TRRS
Connector Type	1/4" TRS
Customer Reviews	4.1 4.1 out of 5 stars (3,511)
Enclosure Material	Metal
Frequency Range	50 hz 16 khz
Frequency Response	50 KHz
Hardware Platform	Camera, Smartphone, Speaker
Importer Contact Information	Origin Marketing Pvt Ltd. Contact: 9870294946, [email protected]
Item Dimensions	6.8 x 16.2 x 20.2 centimeters
Item Highlight	Wireless Microphone set, Beltpack Transmitter and Receiver,for Teaching, Preaching
Item Type Name	Wireless Microphone
Item Weight	9.9 Ounces
Manufacturer	FIFINE
Manufacturer Contact Information	FIFINE - 9870294946
Mfr Part Number	ABCD170019
Microphone Form Factor	Headset
Model Name	wireless lapel microphone
Model Number	K037B
Number of Batteries	2 AAA batteries required.
Number of Channels	1
Number of Items	1
Number of Packs	1
Packer Contact Information	Origin Marketing Pvt Ltd. Contact: 9870294946, [email protected]
Polar Pattern	Unidirectional
Power Source	Battery Powered
Signal-to-Noise Ratio	58 dB
Special Feature	Wireless
UPC	728290254117
Unit Count	1 Count
Warranty Description	N/a.

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