DragonSky GY401M Head Lock Gyro Specification Dimension: 20.0 x 20.0 x 10.0mm Weight: 5.7g with Plastic Case Operation Voltage: 4.8 V ~ 6.0V Operation Current: 15mA (5V) Gyro Gain: Remote / Single Gain Heading Lock: Remote On/Off Features The gyro has been designed for gas and electric powered RC helicopters Dual mode system: Heading lock mode or normal mode The gyro can be used with computer radio and/or non-computer 4-CH radio The gyro gain can be remotely adjusted with 6-CH receiver, with 4-CH receiver it needs to adjust the gain on the ground The temperature compensation circuit has been built in the circuit