StackMat timer
StackMat timers are timing devices designed for use in sport stacking and speedcubing. StackMat timers have two touchpads, one on each side of the display. The hands are placed on the two touch pads. After about a second, a green light will light up, and when one or both of the hands are released from the touch pads, the timer starts. When both hands are placed back on the touch pads, the timer stops.
The StackMat timer is sometimes included with a mat that is made of neoprene, the same material as mouse pads. Some timers also glow in the dark. Others have a data port that allow it to be connected to an external display to allow for an audience to watch the timer in real time.