Specifications: Dead Zone: 2μs Max. Pulse Width: 500-2500us,1500us stop (for transmitter,MCU control board) Operating Voltage: DC4.8V-6.6V Operating Speed: (4.8V) 53 rpm / per minute Operating Speed: (6V) 65 rpm / per minute Dimensions: 40.5X20.2X44.2mm Weight: 55.6 g (1.96oz) Connector Wire Length: JR 265mm (10.43in) Output Gear: 25T (Futaba compatible) Features: Durable plastic case Standard size digital servo High-performance 20KG large torque Metal gear, high quality brushed motor Dual ball bearing supported output shaft Package total weight: 75.00 grams (incl. packaging) Factory description: JX Servo PDI-5521MG 21Kg/ 0.16 Sec @ 6.0V Metal Gear Standard Digital Servo Manufactured by JX Servo Manufacturer number: JX/PDI-5521MG