This is the Futaba R6004FF 2.4GHz FASST 4-Channel Micro Receiver. Compatible with the following FASST transmitters; 6EX, 7C, and the following transmitter modules; TM7, TM8 (on 7 channel mode), TM10 (on 7 channel mode) and TM14 (on 7 channel mode). FEATURES: Designed for short range application such as indoor aircraft only Limited flight range of 300 ft (91.4m) maximum Compatible with standard size connectors only Easy one touch linking to transmitter One year limited warranty INCLUDES: Futaba R6004FF 2.4GHz FASST 4-Channel Receiver with set up sheet REQUIRES: Installing in model and connecting servos and ESC SPECS: Dimensions: 0.81 x 1.39 x 0.30" (20.5 x 35.3 x 7.5mm) Weight: 0.13oz (3.8g) Power Requirement: 4.0V- 8.5V (although this receiver can be used at 8.5 volts, Futaba recommends you follow the voltage specs of your servos). F/S and Battery F/S function (for channel three) Battery F/S Voltage: 3.8V Approximate range of 300 ft (91.4m) jxs 12/23/08 ir/jxs updated jpg 3/3/10