Dont get the GT3b! it use 8 batteries and it have a bad voltage regulator that makes it heat up and drain the batteries.
if you go on flysky you batter get the GT3C, its much batter remote with li-ion battery and light weight.
and if you want a much batter radio get this one, Radiolink RC4G. its 4ch, batter range then the flysky and cheaper. and it have a build in gyro.

Flysky GT3C

Radiolink RC4G

i used them both and the radiolink is awesome.