The white DJI Transmitter for Inspire 1 Quadcopter is the handheld radio controller used to operate the aircraft as well as control the gimbal. You can even use two transmitters with one aircraft, thereby allowing one person to pilot so the second person can concentrate on operating the camera. It features a mini-HDMI (type C) port for connecting an FPV monitor or glasses, plus there is a USB type A port for connecting you mobile device when using the Inspire app.
The transmitter uses a 2.4 GHz band for the control signal, plus there is a 5.8 GHz radio allowing two controllers to be bound together for dual operator flying. In dual operator mode, the "master" transmitter is used by the pilot, while the "slave" transmitter is used by the camera operator to move the camera manually.
Note: The transmitter requires binding before it can be used with your quadcopter. Please refer to the manual for instructions.