This is a Spektrum RC SR6110AT 6-Channel DSMR AVC Telemetry Surface Receiver. Specifications: Type: Surface Receiver # of Channels: 6 Modulation: DSMR/DSM2 Band: 2404 - 2476MHz Length: 1.7 in (42.4mm) Width: 0.94 in (23.9mm) Height: 0.59 in (15.1mm) Weight: 0.35oz (10.0g) Voltage Range: 3.5 - 9.6V Antenna Length: 9 in (229mm)