BN-LINK BNC-U3 is a 24-hour mechanical timer with 6 grounded sockets, designed for both indoor and outdoor use. It allows you to set up to 48 different "ON" and "OFF" times in a 24-hour period, with each push pin representing a 15-minute time interval. The timer features a slide switch for manual override, a bypass switch to disable the timer function, and a push-pin dial for setting the current time. It is ideal for controlling lighting, cooling and heating systems, sprinklers, humidifiers, and other electrical devices.