What is the function of the touch key on phaser?

Phaser touch key is being used to turn the equipment On and OFF. Also it has a safety function to oblige the player to shoot with two hands. Upon activation of the function, the phaser will be blocked when a player shoots with one hand. Another function of touch key is to use the laser pointer of the phaser. If the operator activates this function on software, players can see a visible Laser beam and better target their opponents.