This is the Spektrum DSMX remote receiver with 24" receiver extension.
The remote receiver can be used as a replacement for any DSMX receiver that utilizes a remote receiver. It can also be used as an optional second remote receiver for the AR9010 or fourth remote receiver for the AR9110.
The remote receiver includes one 24-inch extension; however, various lengths of receiver extensions can be purchased allowing various placement options for mounting purposes. Additional remote receiver extensions are available in 6", 9", 12", 24" and 36" lengths.
Type: DSMX Remote Receiver
Length: 0.98 in (25mm)
Width: 0.89 in (23mm)
Height: 0.27 in (9mm)