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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Wireless Microphone System (K037B)

Product ID: 82152731

Details

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

🎤Dual mic options: headset & lavalier for versatile use

📡20 UHF frequencies for interference-free clarity

🔋Battery-powered with low-power LCD alerts

€ 101.97

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Description

🎙️ Elevate your voice, own the room—wireless freedom that speaks success.

DUAL MIC VERSATILITY - Switch effortlessly between a discreet lavalier and a secure headset mic to match your speaking style and setting.
OPTIMIZED FOR IMPACT - Metal collar clip and windscreen reduce unwanted noise, ensuring your voice commands attention in any environment.
PLUG PLAY SIMPLICITY - Unique paired ID synchronization means setup is as easy as plugging in a wired mic—no tech headaches, just speak.
PRO GRADE COMPATIBILITY - Works flawlessly with mixers, PA systems, cameras, and smartphones via included adapters—your all-in-one audio solution.
SEAMLESS WIRELESS FREEDOM - Enjoy crystal-clear audio up to 65 feet with zero static or dropouts—perfect for dynamic presentations and performances.

The Fifine K037B Wireless Microphone System delivers professional-grade audio with 20 selectable UHF frequencies, dual headset and lavalier microphones, and seamless plug-and-play setup. Designed for speakers, teachers, and content creators, it offers up to 65 feet of interference-free wireless range, broad device compatibility, and noise-reducing accessories to ensure your message is heard loud and clear.

Specifications

ASIN	B076F5W8Q5
Antenna Location	Publick Speaking / Presentation / Preaching / Recording
Audible Noise	58 db
Audio Sensitivity	95 db
Best Sellers Rank	#6,015 in Musical Instruments ( See Top 100 in Musical Instruments ) #123 in Wireless Lavalier Microphones & Systems #6,268 in Office Electronics Products
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 4.1 out of 5 stars (3,620)
Enclosure Material	Metal
Frequency Range	565.0 MHz - 584.0 MHz
Frequency Response	15 KHz
Hardware Platform	Camera, Smartphone
Impedance	32 ohm
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	Headset, Lavalier
Model Name	wireless lapel microphone
Model Number	K037B
Number of Batteries	2 AAA batteries required.
Number of Channels	1
Number of Items	1
Polar Pattern	Unidirectional
Power Source	Battery Powered
Signal-to-Noise Ratio	58 db
Special Feature	Clip, Wireless
UPC	728290254117
Unit Count	1 Count
Warranty Description	N/a.

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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€ 101.97

Duties & taxes included

In stock

Sold byAmazon FinlandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

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

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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