Dimensions:40 x 20 x 40 mm ( 1.57x0.79x1.57 in) Operating Voltage:6.0 ~ 8.4 V DC Volts ( 2S Lipo un-regulated) Working frequence:760μs / 560hz Dead band:0.0005ms (Default) Bearing Type:2BB Motor Type:Brushless Motor Gear Type:Chrome-Titanium alloy gear