This is the Xpert HS-6403-HV KD2 Standard Size Full Aluminum Servo.

Features

• Developed and tuned by World Champion Helicopter Master, Kyle Dahl.
• All new software algorithm with the best "connection" with your helicopters.
• All new motor and gear set design with enlarged 2mm gear alignment pins for better durability under impact.
• Auto Adaptive DUAL BAND (760/1520us)
• Auto Adaptive FREQUENCY RANGE (50-1000Hz)
• Quick release cable that allows easy and quick installation for all helicopters.
• Brushless motor design provides extremely high speed, top efficiency, and low power consumption.
• 4096 resolution and SIC (Single Integrated Circuit) for the highest performance and durability.
• All Aluminum case for the best thermal dissipation and durability.
• High-Speed, High-precision 12-bit AD converter and CPU calculation
• Fail safe
• Over current protection
• Over temperature protection
• Start sonorant

Specifications

• Power Supply: 7.4V~8.4V
• Speed (sec/ 60°): 
• @7.4V: .07 sec/60°
• @8.4V: .062 sec/60°
• Torque (oz/in): 
• @7.4V: 366.85 oz-in
• @8.4V: 416.40 oz-in
• Torque (kg/cm): 
• @7.4V: 26.43 kg-cm
• @8.4V: 30.00 kg-cm
• Dimensions: 40x40.5x20 mm
• Weight: 73.2 g
• Range: Auto Adaptive FREQUENCY RANGE (50-1000Hz)
• Center Position: Auto Adaptive DUAL BAND (760/1520us)
• Applications: Helicopter Cyclic
• Matching Gear Set: XGS-S232
  
• Matching Case: