This is the Hitec Aggressor SRX Pro 3-Channel 2.4GHz DSSS Surface Radio System with Atom Micro 3 Receiver and one HS-5485HB Digital Servo. FEATURES: 2.4GHz Direct Sequence Spread Spectrum (DSSS) and FM (PPM) ready 7msec high response mode Ten model memory, four character naming Brake ATL switch and brake level travel limiter Dual mode 3rd channel (shift or linear) Steering wheel tension adjust Transmitter charge jack Programmable features include; Two speed menu scrolling Steering Dual Rate Steering and Throttle Exponential Rates End Point Adjustments Idle Up Adjustable Steering, Brake and Acceleration Rates Sub Trims for Quick and Easy Set-up Timer Servo Reverse Atom 3-channel DSSS micro surface receiver (HRCL4000) HS-5485HB programmable standard size digital servo with heavy duty Karbonite gears (HRCM5485) INCLUDES: Hitec Aggressor SRX Pro 3-ch Transmitter, Atom 3-ch Surface Receiver, one HS-5485HB Servo, Servo Saver, Spectra Module, four AA Battery holder, On/Off Switch and Instruction Manual REQUIRES: AA Cells: Eight for transmitter SPECS: Specs for transmitter not provided by manufacturer Receiver: Size: 1.22 x 0.75 x 0.47" (31 x 19 x 12mm) Weight: 0.24oz (6.8g) Current Consumption: 40mA Operating Voltage: 4.8 - 7.4V Servo: Speed: 0.20sec/60 degrees at 4.8V Torque: 5.2 kg-cm (72 oz-in) at 4.8V Dimensions: 1.57 x 0.78 x 1.49" (40 x 20 x 38mm) Weight: 1.59oz (45g) jxs 01/03/10 ir/jxs