This is the KST X12-508 Micro Servo, a high-performance and high-torque standard digital servo designed for use in 450 Class Helicopter Cyclic applications. It operates at a voltage range of DC 4.8-8.4V and has dimensions of 23x12x27.5mm with a weight of 2g. Its working torque is [email protected], [email protected], and [email protected], while its maximum speed is 0.09sec/60°@6.0V, 0.08sec/60°@7.4V, and 0.07sec/60°@8.4V. The motor type is coreless and it features a high-precision metal gear. The package includes 1 KST X12-508 Micro Servo.