Traxxas 1/10 Summit TQi 4-Ch BLUETOOTH LINK ENABLED RADIO & 5-Ch RECEIVER Traxxas TQi Link 2.4 GHz, 4-Channel High Output Transmitter (Part # 6530) Bluetooth Link Enabled (Bluetooth Module Not Included) Only Compatible With Traxxas Part # 6518 Receiver Is Not Compatible With Older Traxxas Receivers Requires Four (4) AA Batteries (Not Included) Traxxas TQi Link 2.4 GHz, 5-Channel Receiver (Part # 6518) Only Compatible With Traxxas TQi Transmitters (2ch, 3ch, and 4ch) Not Compatible With Older Traxxas Transmitters Dimensions 1.5 x 1.02 x 0.4 Includes: TQi Transmitter Link Enabled 2.4GHz 4CH (Part # 6530) TQi 5-Channel Receiver (Part # 6518) Part number(s) included (in factory packaging): 6530 6518