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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GTD Audio 4x800 Selectable Frequency Channel UHF Diversity Wireless Hand-held/Lavaliere Headset Microphone Mic System (4 Hand held Mics)

GTD Audio 4x800 Selectable Frequency Channel UHF Diversity Wireless Hand-held/Lavaliere Headset Microphone Mic System (4 Hand held Mics)

Product ID: 446478406

Details

Recommended uses for product
Karaoke
Brand
GTD Audio
Model name
G-787H
Connectivity technology
UHF
Connector type
XLR
Special feature
Wireless

🎤Supports 40 mics simultaneously

📡600 ft wireless range

📶800 selectable frequencies/channel

AED 2881

Duties & taxes included

In stock

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Description

🎙️ Own the stage with flawless wireless freedom

PRO GRADE RANGE - Reliable wireless performance up to 600 feet for large venues and events
EFFORTLESS AUTO SYNC - Automatic frequency scanning and transmitter-receiver pairing saves setup time
TRUE DIVERSITY RELIABILITY - Dual-antenna tech ensures crystal-clear sound with no signal loss
MASSIVE MULTI MIC CAPABILITY - Run up to 40 microphones simultaneously without dropouts
UNMATCHED FREQUENCY FLEXIBILITY - 800 selectable UHF channels per mic for zero interference

The GTD Audio G-787H is a professional 4-mic wireless system featuring 800 selectable UHF frequencies per channel, true diversity operation for enhanced signal stability, and automatic frequency scanning for seamless setup. Supporting up to 40 microphones simultaneously and offering a 600-foot range, it’s engineered for large-scale events, karaoke, and live performances demanding crystal-clear audio and rock-solid reliability.

Specifications

ASIN	B07KRMX7VH
Antenna Location	Karaoke, Singing
Audible Noise	120 Decibels
Audio Sensitivity	85 Decibels
Best Sellers Rank	111,827 in Musical Instruments & DJ ( See Top 100 in Musical Instruments & DJ ) 2,245 in Wireless Microphones & Receiver
Box Contents	Receiver, Transmitter
Brand	GTD Audio
Brand Name	GTD Audio
Colour	Black
Compatible Devices	Headphone
Connectivity Technology	UHF
Connectivity technology	UHF
Connector Type	XLR
Connector type	XLR
Enclosure Material	Metal
Frequency Response	590 MHz
Hardware Platform	Karaoke Machine
Item Dimensions	43.2 x 17.8 x 5.1 centimetres
Manufacturer	GTD Audio
Manufacturer Part Number	G 787
Microphone Form Factor	microphone system
Model Name	G-787H
Model Number	G 787
Model name	G-787H
Number of Channels	4
Number of Items	4
Polar Pattern	Omnidirectional
Power Source	Corded Electric
Recommended uses for product	Karaoke, Singing
Signal-to-Noise Ratio	120 dB
Special Feature	Wireless
Special feature	Wireless
UPC	854318007356
Unit Count	1.0 count

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