Graupner Gr-18 Pro + 3Xg + 3A + Vario 9 Channel Receiver HOPPING TELEMETRY TRANSMISSION 2.4 GHz technology with two-way telemetry, updatable firmware? The newest features always! Servo connections end of the receiver All servo connectors use JR style connectors; analog/digital servo compatible The receiver supports generation of SUMO/SUMI/SUMD signal output on Ch. 9 for the convenient use of gyros and control boards Programmable fresh rate of 10 and 20ms?20 mms recommended for analog servos to avoid servo ?growl? Small form factor with two 5.5" antennae is ideal for reducing servo wiring runs and provides redundant, enhanced range transmission