head lock gyro with remote gain. Great performance at a geat price. With work well on all micro helicopters. Specification: Intelligent drift canceling Circuit design, more precise operation angular speed inertia, more wide lock range, is suitable for low tail rotor rotational speed 6435rpm Dual Mode:Standard gain mode and head-lock mode. Built-in drift cancel circuit. Temperature compensation circuit. Tail rudder direction switch. Dual Gain Control on gyro and transmitter. Apply for standard and digital servo Compatible Futaba PCM/JR SPCM/Hitec QPCM receiver Voltage:4.2~7V Power consumption:Approx.33mA Rating voltage:DC+4~+6V Temperature range:-5¡ãC~+60¡ãC Dimension:23.5x21x15mm Weight:9.4g Accessories: Double-sided tape x1 sheets