This is the S3171SB Serial Bus Digital Programmable Slim Servo from Futaba.

FEATURES: Compatible with the Futaba S.Bus System
          Servo can be easily programmed with the SBC-1 Channel Setting Tool,
            S.Bus receiver or PCLink software
          Equipped with dual ball bearings
          Also compatible with Futaba receivers and transmitters manufactured
            after 1982
          One year limited warranty through Hobby Services beginning at date of
            purchase

INCLUDES: Futaba S3171SB Serial Bus Slim Digital Servo, 1" (26mm) 4-point horn,
            1.4" (35mm) round horn, 1.5" (39mm) 4-point horn, 1.8" (45mm)
            double arm horn, two each grommets, eyelets and screws, instruction
            sheet

REQUIRES: Programming, installing in model and connecting linkage

SPECS:    Dimensions: 1-3/16 x 7/16 x 1-1/8" (30 x 11 x 29mm)
          Torque: 4.8V 51 oz-in (4 kg-cm)
          Speed: 4.8V 0.24 sec/60°
          Weight: 0.8oz (20g)

                                                                   jxs 06/16/10
                                                                         ir/jxs