This is the 8169 Digital High Voltage High Torque Heli/Car Servo from Ace RC.

FEATURES: Compatible with 2S LiPo or LiFe batteries without needing to use a
            regulator
          Three titanium and one alloy aluminum gear for continuous non-stop
            operation and reduced weight
          High torque output with low current draw
          Water and dust resistant
          Aluminum middle case section for efficient heat dissipation
          High performance coreless motor

INCLUDES: 8169 Digital High Voltage Heli Servo with Lead and Connector, 1.9"
            (47.5mm) double sided Servo Horn, 1.7" (42.5mm) double sided Servo
             Horn
          Four each, Grommets, Eyelets, 3x11mm Screws and 3mm Locknuts
          Instruction Sheet

SPECS:    Voltage Range: 6.6-7.4V (2S LiPo or LiFe)
          Pulse Width: 1520us
          Torque: 17.5 kg-cm @ 7.4V
          Transit Time: 0.08 sec/60° @ 7.4V
          Dimensions: 1.6 x 0.81 x 1.5" (41.8 x 20.6 x 39.6mm)
          Weight: 2.19oz (62g)

COMMENTS: A note on coreless motors. A conventional servo motor has a steel
            core armature wrapped with with wire that spins inside the magnets.
           In a coreless design, the armature uses a thin wire mesh that forms
           a cup that spins around the outside of the magnet eliminating the
           heavy steel core. This design is much lighter resulting in smoother
           operation and faster response time.

                                                                   jxs 01/15/13
                                                                         ir/jxs