This is the Ace TG7000 Heading Lock Gyro for Model Helicopters. FEATURES: Heading lock mode and normal mode SMM gyro sensor Remote-controlled gain Analog/digital servo compatible Suitable for 760/1520us digital servo Separate end point adjustment for left and right servo travel limit Compact size INCLUDES: One TG7000 heading lock gyro _ One metal plate Three pieces of double sided mounting tape One plastic screwdriver Instructions REQUIRES: Installation following the included instructions SPECS: Length: 1.01" (25.9mm) Width: 0.98" (24.9mm) Height: 0.80" (20.4mm) Voltage: 4.8-6.0V Operating Temperature: -10 - 45 °C Weight: 0.83oz (23.5g) ajw 3-7-11 ir/jxs