This is the Futaba R6004FF 2.4GHz FASST 4-Channel Micro Receiver. The R6004FF is 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). Designed for short range application such as indoor aircraft only with a limited flight range of 300 ft (91.4m) maximum. Compatible with standard size connectors only and features easy one touch linking to your transmitter.
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 F/S and Battery F/S function (for channel three)
Battery F/S Voltage: 3.8V
Approximate range: 300 ft (91.4m)