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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🎤 Own the stage with flawless wireless freedom!

RUGGED METAL BUILD - Durable metal construction designed to withstand the rigors of professional events and touring.
TRUE DIVERSITY RECEPTION - Dual antenna diversity ensures stable, drop-free wireless performance even in crowded environments.
CRYSTAL CLEAR AUDIO CLARITY - Experience professional-grade 120 dB signal-to-noise ratio for pristine, noise-free sound that commands any room.
INSTANT AUTO FREQUENCY SCAN - Smart automatic scanning locks onto the best available frequency, so you never miss a beat or a word.
SEAMLESS MULTI CHANNEL CONTROL - Switch effortlessly between 4 high-capacity frequency channels to avoid interference and stay on top of your sound game.

The GTD Audio 4x800 Selectable Frequency Channel UHF Diversity Wireless Handheld Microphone System (Model 787H) delivers professional wireless audio with 4 selectable 800 MHz channels, true diversity reception, and a superior 120 dB signal-to-noise ratio. Built with a durable metal frame and featuring automatic frequency scanning, it’s engineered for flawless performance at any event or venue.

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Material	Metal
Signal-to-Noise Ratio	120 dB
Number of Channels	4
UPC	854318007356
Batteries Included	No
Batteries Required	No
Item Model Number	G 787
Special Features	Wireless
Product Dimensions	43.18 x 17.78 x 5.08 cm; 4.1 kg

GTD Audio 4x800 Selectable Frequency Channel UHF Diversity Wireless Handheld Microphone Mic System (4 Hand held Mics) 787H

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