This is the Hitec Flight Pack for the Multiplex Blizzard (MPUA2233). FEATURES: 6-channel autoshift Neutron 6S micro receiver is compatible with all modern FM 72MHz transmitters Mini size servos with universal connectors, extra servo horns and mounting hardware Servo extensions INCLUDES: Neutron 6S Receiver Two HS-55 Servos: (HRCM0982) Two HS-65HB Servos: (HRCM1352) Four 12" Extensions: (HRCM7345) Two 24" Extensions: (HRCM7346) SPECS: Neutron 6S Receiver- Size: 1.6 x 0.9 x 0.6" (40.5 x 23 x 16mm) Input Voltage: 4.8 - 8.4V Weight: 0.621oz (17.6g) HS-55 Servo- Weight: 8.0g (.28oz) Speed: 0.17 sec/60° @ 4.8V 0.14 sec/60° @ 6V Torque: 15 oz/in (1.1 kg/cm) @ 4.8V 18 oz/in (1.3 kg/cm) @ 6V Size: .90 x .45 x .94" (23 x 12 x 24mm) HS-65HB Servo- Weigth: 0.44oz (12.5g) Speed: 0.14sec/60° @ 4.8V 0.11sec/60° @ 6V Output Torque: 24.99 oz-in (1.8 kg-cm) @ 4.8V 30.55 oz-in (2.2 kg-cm) @ 6V Size: 0.92 x 0.45 x 0.94" (23.6 x 11.6 x 24mm) REQUIRES: Hitec 72MHz Dual Conversion Crystal to match transmitter, HRCL01** jxs 12/01/09 ir/jxs