How can i huy just the microphones?

You can buy them from GTD Audio. Go to gtdaudio.net and search for 787

What kind of rechargeable batteries can you use in this unit, they can be used because I try Duracell but they are a little fat and someone broke one.

** DO NOT DO NOT ** Use rechargeable batteries in microphones (or any device) that uses standard batteries!! Standard batteries are 1.5volts. Rechargeable are 1.2 volts. So if you microphone uses two batteries, it is working with 3 volts. However, if you are using rechargeable batteries, you are only giving it 2.4 volts which means it may have reduced range and cause other problems, as 2.4 volts is like weak regular batteries. When someone like Shure provides a rechargeable battery pack option, the pack is actually containing THREE batteries in the pack - even though it fits into a two battery compartment thereby providing 3.6 volts for a 3 volt device. Again... you will have many problems if you try to use rechargeable batteries in a device like this!!

Does this system have echo cancellation built in? (to avoid ringing / resonance)?

It does not and these mics are fairly susceptible to feedback, however you can usually eq the rings out just fine or use the gain control on the receiver to decrease the sensitivity.

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GTDaudio 4x800 Adjustable Channels UHF Diversity Wireless Cordless Handheld Microphone Mic System Ideal for Church, Karaoke, Dj Party, Range 450ft (4 Handheld Mics)

GTDaudio 4x800 Adjustable Channels UHF Diversity Wireless Cordless Handheld Microphone Mic System Ideal for Church, Karaoke, Dj Party, Range 450ft (4 Handheld Mics)

Product ID: 632933764

Details

Recommended Uses For Product
Singing
Brand
GTD Audio
Model Name
G-787H
Connectivity Technology
XLR
Connector Type
XLR

🎤4 adjustable handheld mics

📡450ft wireless range

📶800 selectable frequencies

Description

🎤 Own the stage, wire-free and worry-free!

TRUE DIVERSITY TECH - Experience ultra-reliable signal with true diversity operation that slashes dropouts and boosts range.
EFFORTLESS SYNC SETUP - One-touch transmitter and receiver synchronization means zero hassle, all pro-level performance.
AUTO FREQUENCY SCANNING - Smart scanning locks onto the clearest channel automatically—cutting interference for crystal-clear sound.
PRO GRADE RANGE CLARITY - Command the room with a massive 450ft range and 120dB signal-to-noise ratio for pristine audio.
SEAMLESS MULTI CHANNEL MASTERY - Operate up to 20 sets simultaneously with 800 frequency options—never miss a beat in crowded venues.

The GTD Audio 4x800 UHF Diversity Wireless Microphone System delivers professional-grade wireless audio with 4 handheld mics, 800 selectable frequencies, and a robust 450ft range. Featuring true diversity technology and automatic frequency scanning, it ensures interference-free, crystal-clear sound ideal for churches, karaoke, DJs, and parties.

Specifications

ASIN	B07KRMX7VH
Antenna Location	Karaoke, Singing
Audible Noise	120 Decibels
Audio Sensitivity	85 Decibels
Box Contents	microphone
Brand	GTD Audio
Brand Name	GTD Audio
Colour	Black
Compatible Devices	Headphone
Connectivity Technology	XLR
Connector Type	XLR
Country of Origin	USA
Enclosure Material	Metal
Frequency Response	590 MHz
Hardware Platform	Karaoke Machine
Item Dimensions	43.2 x 17.8 x 5.1 Centimeters
Manufacturer	GTD Audio Inc
Manufacturer Part Number	G 787
Microphone Form Factor	microphone system
Model Name	G-787H
Model Number	G 787
Number of Channels	4
Number of Items	4
Polar Pattern	Omnidirectional
Power Source	Battery Powered
Recommended Uses For Product	Karaoke, Singing
Signal-to-Noise Ratio	120 dB
Special Feature	Wireless
UPC	854318007356
Unit Count	1 Count

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