Pro-tronik PTK 7450NG-D 9g Digital Servo for RC 450 Helicopter Fixed-wing CoptersSpecifications:- Control system: Swip- Voltage range: 4.8-7.4V- Temp.range: -20~+60¡ÆC- Torque: 2kg/cm@4.8V; 2.3kg/cm@6.0V; 2.5kg/cm@7.4V- Empty speed: 0.105sec/60¡Æ; 0.098sec/60¡Æ; 0.087sec/60¡Æ- Empty current: 3mA- Operation current: 165mA@4.8V; 200mA@6.0V; 210mA@7.4V- Locked current: 0.85mA@4.8V; 1.05A@6.0V; 1.2A@7.4V- Dead zone: 2us- Response time: 3us- Servo arm range: 120degree- Dimension: 23.6*26.9*11.7mm- Weight: 10.85g- Cable length: 250mm