Walkera 4#3 - HM4#3 (RTF) Specification 1). Overall Length: 185 mm 2). Main Rotor Diameter: 180 mm 3). Tail Rotor Diameter: 50 mm 4). All-up Weight: 45.5g (Battery included) 5). Tail Motor: N51 (Strong magnet) 6). Drive Motor: 1215 (Strong magnet) 7). Battery: 3.7V 400mAh Li-Po battery 8). Transmitter: WK-0405 9). Gyro: Built-in 10). Receiver: RX-409 11). Servo: weight 3.5g;speed 0.11sec/60 Available Options: Extra Main Blade: No, thanks  Main Blades x 1 (  + US$5.00 )Main Blades x 2 (  + US$10.00 )Main Blades x 3 (  + US$15.00 ) Extra Battery: No, thanks  Battery x 1 (  + US$5.00 )Battery x 2 (  + US$10.00 )Battery x 3 (  + US$15.00 ) Transmitter Mode: Mode 1 - Right Hand Throttle  Mode 2 - Left Hand Throttle   Charger: US - 2 Flat pins plug  UK - 3 Flat pins UK plug  Europe - 2 Round pins plug  AU - 3 Flat pins AU plug   Frequency: ANY  35MHz  72MHz   This product was added to our catalog on Thursday 20 September, 2007.