... Built-in gyroscope Speed adjustment,easy to fly Single propeller rc helicopter, Built in gyro for extra stability Funtion: asced ... hovering,sideward flight,exect directional Two of the lithium battery and with two battery charger, remote control with balance high-grade LCD ... EN62115,RTTE,EN71,ROHS,ASTM,6P1.product battery: lithium battery 3.7 V / 100MAH2.remote controller battery: 6 * AA (not included)3 ...