This is the Futaba S3115 Micro High Torque Servo. This servo replaces the Futaba S3101 Servo. This servo can produce high-current draw from your batteries. If using NiMH or LiPo batteries, make sure they are capable of delivering sufficient amps. FEATURES: Ideal for electric planes and small electric helis Nylon gears One year warranty INCLUDES: Futaba S3115 Micro High Torque Servo One 1" (25.4mm) 4 arm servo horn (installed on servo) One 1.5" (39mm) 4 arm servo horn One 1.75" (45mm) straight servo horn One 1.4" (35mm) diameter round servo horn Two eyelets Two rubber grommets Two 2x12mm washer head self threading screws (phillips head) REQUIRES: Installing in aircraft and connecting to receiver SPECS: 4.8V Torque: 39 oz-in (2.8 kg-cm) Speed: 0.15 sec/60° Dimensions: 1.1 x 0.5 x 1.2" (1-1/8" x 1/2 x 1-3/16")(28 x 13 x 30mm) Weight: 0.60oz (5/8oz) (17g) Lead Length: 6.5" (165mm) COMMENTS: Do not use S3115 servos with gas or high power engine models, large gliders, or other models that require high torque Using supply voltage higher than 4.8V or applying high load to the servo will shorten the life. Alway use the servo horn specially designed for this servo. Do not use conventional servo horns. Excessive force or shock to the servo horn may damage the ultra mini precision gears inside the servo. For replacement gears use part number FUTM3404 jxs 11/16/06 kpm12/06/2006 ir/jxs updated jpg 9/4/07