This is the HPP-21+ PC and Field Programmer for Hitec Digital Servos. FEATURES: Programs Hitec programmable digital servos directly from a PC or in the field Programmable parameters include; Servo Manual and Auto Test Dead Band Width Speed (reduce) Direction (CW/CCW) Fail Safe Position Fail Safe On/Off End Points Tests and cycles all manufacturers" servos Free downloadble software USB PC connection INCLUDES: Hitec HPP-21+ PC and Field Programmer with instruction sheet REQUIRES: 4.8V battery to power servo USB Cord Downloading the software at: www.hitecrcd.com SPECS: Length: 48mm (1.9") Width: 30mm (1.2") Height: 20mm (0.8") COMMENTS: The following parameters are also programmable in the Hitec HS-79XX G2 digital servos; Overload Protection and High Resolution (on/off). jxs 7/13/09 ir/jxs