Its Unused radio transmitter with receiver.

HobbyKing 2.4Ghz 6Ch Tx & Rx V2 (Mode 2)(THROTTLE ON THE LEFT)
Hobbykings T6A 2.4ghz system is an entry level transmitter offering the reliability of 2.4Ghz signal technology and a receiver with 6 channels.
This transmitter requires a PC to modify any of the channel variables including mixing and servo reversing.

Key Features;
6-channel 2.4GHz transmitter with servo reversing.
Easy to use control for basic models.
Includes 6-channel receiver
Trainer system option.
This system must be programmed via PC cable.

Included;
1 x 2.4Ghz transmitter
1 x 2.4Ghz Receiver
1 x Bind Plug.

Note:
Shipping Extra.

Link:-
http://www.rcjunk.com/rc-listing/2-4ghz-6ch-tx-rx-v2-mode-2-hobbykking/