Highlights 2-channel full scale remote control. Omni-directional flight. With lights, built-in gyroscope and excellent flying performance. Can fly about 7.5 minutes if fully charged.     General Spec Model 851B    Type wireless remote control Channel 2-channel Material metal alloy Light support Gyro support    Function support forward, backward, ascending, descending, convolution and turn left or right function. Compatibility It’s suitable to fly indoor. Battery for Helicopter built-in 3.7V 350mAh Li-poly rechargeable battery Battery for Radio Control 3 × 1.5V AA battery (not included) Others a set of accessories, random shipment