Remote key for control of vehicles

A remote key for control of a vehicle includes a touch panel, a storage device, a touch sensing unit, and a micro controller. Function icons arranged on the touch panel are operable to control a vehicle to perform a function. The storage device can store coordinates of the function icons and a mapping list defining a relationship between predetermined touches and predetermined functions. The touch sensing unit can sense user touches applied to the touch panel. If the micro controller determines that a sensed touch matches one of the predetermined touches, the micro controller can further search the mapping list to determine a function corresponding to the sensed touch, and generate a remote control signal for controlling the vehicle to execute the function.