This is the Traxxas TQi Docking Base. FEATURES: Used in conjunction with the Traxxas TQi DSSS 2.4GHz high output radio, this docking base allows user"s iPhone 3G/3GS/4/4S or 2nd/3rd/4th generation iPod Touch along with the Traxxas Link App to deliver an intuitive, high definition graphical user interface featuring Real-Time Telemetry, Customizable Dashboards, Steering/ Throttle Expo, Steering/Braking Dual Rate, Servo Reversing, Endpoint Adjustment, Profile Customization and Sharing INCLUDES: Traxxas TQi Docking Base with four Foam Spacers and Instruction Sheet REQUIRES: Four AA batteries or Traxxas #3037 NIMH 5C 6V 1200 Battery, TRAM3037 Traxxas TQi DSSS 2.4GHz high output radio system* Apple iPhone (3G, 3GS, 4 and 4S) or iPod touch (2nd generation and later versions) Downloading Traxxas Link App (download from the App Store) COMMENTS: *Will not work with other Traxxas radios or other brands of RC car radios. jxs 03/30/12 ir/jxs updt jxs 10/11/12