Description:    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 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 and Features 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 Degree Weight: 0.8oz (20g)