From the Manufacturer
This is the Align DS650 Digital Servo, a powerful and precise servo suitable for 600/700 rudder use. The DS650 features a Coreless Motor Design with 12 Bits signal resolution for fast speed, high efficiency, low power consumption, and smooth movements. The aluminum alloy mid case looks great and provides fast heat dissipation, maintaining the servo’s high efficiency. The hardened high strength superalloy gears will increase the lifespan of the servo as well.