the "Ultra Torque" HS-7950TH is designed to operate on a two cell LiPo Pack. Featuring our high resolution "G2" second generation programmable digital circuit and our indestructible Titanium gears, The HS-7950TH has the performance and durability you've come to expect from a Hitec servo. Other features in the HS-7050TH include a 7.4v optimized coreless motor, integrated heat sink case, and a top case with two hardened steel gear pins supported by axial brass bushing. The HS-7950TH has been designed for the most demanding hobby applications including the largest aircraft and monster trucks. Featuring a titanic 403oz./in. of torque at 6.0 volts, while still maintaining a respectable 0.15 second transit time Specs Size Category:Standard Type:Digital Application:Larger Air and Surface products Torque:403 oz/in @ 6V, 486 oz/in @ 7.4V Speed:0.19/0.15 sec @ 60 deg. (4.8v/6v) Weight:2.34oz (66 g) Bushing Or Bearing:Bearing Bearing:Dual Motor Type:Coreless Gear Type:Metal Gear Material:Titanium Programable Features Include: Dead Band Width Direction of Rotation Speed of Rotation (slower) End Points Neutral Points Fail Safe On/Off Fail Safe Point 1.Resolution (default is high resolution) 1.Overload Protection (default is off) 1.These features are only programable with the HFP-20, HPP-20 or HPP-21 programmers.