This is the Futaba R2104GF 2.4GHz FHSS 4-Channel High Voltage Receiver.

FEATURES: For use with the 4-PL S-FHSS four channel surface radio
            Normal and High-Speed Modes:
             Normal mode frame rate is (FHSS/S-FHSS) 13.63ms and accepts any
               type of servos or peripherals.
             High-Speed mode (in 4PL tx only), with an output of 6.8ms accepts
              digital servos including the BLS series and most peripheral
              equipment such as brushless ESCs
          Flexible coaxial antenna that's easy to position inside a model for
            ideal reception
          One year limited warranty through manufacturer beginning at date of
            purchase

INCLUDES: Futaba R2104GF 2.4GHz FHSS 4-Channel Receiver with instruction sheet

REQUIRES: Installing in model and connecting battery and servos
          Linking to transmitter

SPECS:    Power Requirement: 3.5V - 8.4V shared with servos
          Voltage: 3.5V - 8.4V
          Dimensions: 1.54 x 1.02 x 0.39" (39 x 26 x 10mm)
          Weight: 0.28oz (8g)

COMMENTS: This receiver does not work with the Futaba FASST system.
            Futaba FASST systems and FHSS are not compatible with each other,

                                                                   jxs 01/14/11
                                                                         ir/jxs
                                                              updt jxs 12/05/11