The ASSAN MEMS GA-250 is a high-performance tail-lock gyro specially optimized and designed for RC 3D helicopters. The GA-250 Gyro is the most competitively priced MEMS 250 class gyro on the RC market today! Main Technical Characteristics Sensor: MEMS System control: AVCS (Angular Vector Control System) Dual-Gain Function: Two modes can be selected via the TX, AVCS mode or Rate mode. Digital Servo support: 1520us, 760us and 960us. Specifications Working voltage: DC 3.0 ~9V Working current: 20 mA (@ 5.0v) Working temperature: -5~60C External dimensions: 21 × 21 × 10 mm Weight: 8g (Inc plugs and wire)