The now famous HK401B is known to have the same characteristics as the Futaba GY401. In fact we guarantee you wont know the difference! No tail drift, excellent hold characteristics and a level of reliability only found in R1000+ gyros. Dont risk your heli with other cheap Gyros when the HK401B has been proven by thousands of pilots to be stable and accurate in a variety of temperatures and helicopters. Functions: Compatible with both Digital and Analog systems Minimizes rudder trim changes caused by wind, other meteorological changes, and varieties of helicopter attitude changes are automatically cancelled. Sensor vibration proofing Simple sensitivity adjustment Specifications: Digital proportional RIC system Operating voltage: 4.8V ~6V( common for receiver) Operating temperature: -lOL r-.rf-45 C Dimensions: 28x26x20 mm Operating current: 80mA