This is the Futaba BLS155 Aircraft High Torque Brushless Servo.

FEATURES: Designed for aircraft applications requiring high torque
          Standard size
          Equipped with metal gears and two ball bearings
          30% faster response than standard digital servos and five times
            longer lasting than servos with brushed motors
          Same power consumption as brushed digital servos
          One year limited warranty

INCLUDES: Futaba BLS155 Brushless Aircraft High Torque Servo with universal
            connector, (21mm) diameter round horn, 1.8" (45mm) diameter round
            horn 1.2" (32mm) diameter 6-point horn, 1.5" (38.8mm) diameter 4-
            point horn, mounting screws, eyelets and grommets

REQUIRES: Installing in aircraft, connecting linkage and connecting to
            receiver

SPECS:    Torque: 200 oz-in (14.4 kg/cm) @ 4.8V
                  250 oz-in (18.0 kg/cm) @ 6.0V
          Speed: 0.19 sec/60° @ 4.8V
                 0.15 sec/60° @ 6.0V
          Size: 1.60 x 0.80 x 1.50" (40 x 20 x 36.8mm)
          Weight: 2.30 oz (64g)
          Spline: 6 mm

                                                                    jxs 6/24/09
                                                                         ir/jxs
                                                            updated jpg 4/11/13