Large Look Out Sensor. Unit Alerts forklift drivers and pedestrians of dangerous encounters around blind corners. Installation is simple Plug it into an outlet and you're done Unit can be hung at any corner, and is designed to mount to any style rack upright. Features: 24 Volt plug-in wall transformer for a 110 Vac receptacle Fork Lift Sensor Ceiling Hung 1 box 4 sensors 4 lights 50 ft. power cord with transformer