This is the HPI SF-50WP Analog Waterproof Servo.

FEATURES: Metal gears for smooth operation without backlash
          Heavy duty servo horn
          Compatible with all Futaba radios and HPI RF receivers
          Ideal for use as a steering servo

INCLUDES: HPI SF-50WP Analog Waterproof Servo with Universal Receiver Connector
          Heavy duty servo horn, HPIC4098
          Instruction Sheet

SPECS:    Voltage: 4.8 - 6.0V
          Torque: 266.6oz/in (12kg/cm) at 6.0V
          Speed: 0.18 sec/60° at 6.0V
          Dimensions: 1.2 x 0.83 x 1.1" (30.9 x 21 x 29mm)
          Weight: 2.04oz (58g)

                                                                   jxs 11/21/11
                                                                         ir/jxs