This is the Spektrum AR8000 8-Channel 2.4GHz DSMX Receiver.
Spektrum is committed to offering receivers to modelers in all categories within the hobby, and the AR8000 is no exception to that commitment. The AR8000 is packed with industry-leading features including an incredibly fast input-to-output response with an 11-millisecond frame rate when used with capable transmitters, 2048 resolution for ultra-smooth servo travel, and a compact footprint making it ideal for any application from extreme 3D to competition helicopter performance.
Type: AR8000 DSMX High-Speed 8-Channel Receiver
# of Channels: 8
Length: 1.35 in (34.3mm)
Width: 1.27 in (32.3mm)
Height: 0.45 in (11.4mm)
Weight: 0.33 oz (9.4g)
Voltage Range: 3.5V-9.6V