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.

ASIN	B07KRMX7VH
Audio sensitivity	85 Decibels
Colour	Black
Compatible devices	Headphone
Frequency response	590 MHz
Hardware platform	Karaoke Machine
Impedance	600 Ohms
Included components	Microphone
Item dimensions L x W x H	43.2 x 17.8 x 5.1 centimeters
Item model number	G 787
Manufacturer	GTD Audio
Material	Metal
Microphone form factor	microphone system
Number of channels	4
Polar pattern	Omnidirectional
Power source	Battery Powered
Product Dimensions	43.18 x 17.78 x 5.08 cm; 4.1 kg
Signal-to-noise ratio	120 dB
Special features	Wireless
UPC	854318007356

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

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