HS-7954SH Hi Voltage Ultra Torque, Steel Gear, Digital, Dual Ball Bearing (403oz/in 0.12 sec.@7.4V 1.57 x 0.78 x1.45")

This is the HS-7954SH High-Voltage Ultra Torque Digital Servo from Hitec.

FEATURES: Ideal for giant scale planes, large helicopters, rock crawlers,
            monster trucks, 1/8 scale trucks and buggies and anywhere a high
            performance, high torque servo is needed
          Coreless motor for precise centering and accuracy
          G2 programmable digital circuit, programmable features include;
            Dead Band Width            Speed (reduction)
            Fail Safe Position         Direction (CW/CCW)
            Fail Safe On/Off           End Points
          Overload Protection        Resolution High/Low
          Steel gears for much longer life than conventional metal gears
          Nine O-rings for extra resistance to moisture and dust
          Capable of operating on two cell LiPo packs

INCLUDES: HS-7954SH High-Voltage Ultra Torque Servo, 1.8" (45mm) diameter round
            horn, 2.3" (59mm) long double sided horn, 2.8" (72mm) long double
            sided horn, 1.3" (34mm) single sided horn, 0.83" (21mm) single
            sided aluminum horn, 0.98" (25mm) single sided horn, four each
            grommets, eyelets and mounting screws, instruction sheet

REQUIRES: Installing in model and connecting to control linkage and receiver

COMMENTS: This servo can be programmed with any Hitec digital servo
            programmer. However, the Overload Protection and Resolution High/
            Low can only be programmed with the HFP-20 (HRCM4430), HPP-21
            (HRCM4420) or the HPP-21+ (HRCM4421)

          A note on coreless motors-a conventional servo motor has a steel core
            armature wrapped with wire that spins inside the magnets. In a
            Coreless design, the armature uses a wire mesh that forms a cup
            that spins around the outside of the magnet. This arrangement is
            much lighter resulting in smoother operation and faster response
            time.