Features Specifications:4#3A Electric R/C Helicopter(KEH4#3A) Specification 1). Main Rotor Diameter: 202 mm 2). Tail Rotor Diameter: 48 mm 3). Overall Length: 213 mm 4). All-up Weight: 48g (Battery included) 5). Drive Motor: 1220(Strong magnet) 6). Tail Motor: N51 (Strong magnet) 7). Battery: 3.7V 400mAh Li-Po 8). Receiver: RX-2406 9). Gyro: Built-in 10).Transmitter: WK-2401 11).Servo: weight 3.5g ; speed 0.11sec/60o(4.8V); torque 0.30kg/cm(4.8V);dimension 17.5X6.5X21.5mm Features 1). Simplified 90oswashplate with CNC-cut rotor head features durability and stability. 2). New 2.4G technology with the functions of automatic identification, precise code pairing and strong anti-jamming. 3). High performance 1220 motor powered by 3.7V 400mAh Lipo offers 7- to 9-minute flight time, depending on your flight mode.