Absolutely Necessarily Part It's used with the brush motor...

Absolutely Necessarily Part Performence is similar to the FUTABA3003 standard servo. The ARTR is already including this Servo....

Optional Part Very tiny photo transmitter module,including the CMOS camera(360 lines). 2.4G wireless video transmitters.use the standard receiver, pulg and play directly from the receiver to take power. with four frequencies. please require clear when you order. generally recommend to install at the diver position....

Include 6 ch protect,such as loss signal,leak,low voltage,high pressure,deep protect....

Optional Part This is used for mixing two channels.usually used to mix-control the left and right two hosts or the boat's X-rudder.if the remote control contains a mixing function,you needn't to buy this equipment extra....