TWISTER® Light was developed for the intraoperative stimulation of nerves and muscles. The device is easy to use and does not need to be connected to a PC. Nerves and muscles can be identified and their function monitored visually or through palpation. TWISTER® Light can be used where no complex monitoring with acquisition of effector organ signals is required. (EMG, muscle action potentials). Applications include predominantly the location and function check of the N. facialis by visual and palpatory means in facial muscles.