Accurate timers are important for a variety of processes. Hydroponics gardening is no exception. Sentinel has developed TWO timers that are specifically designed to control the critical timing functions of a normal hydroponics garden. No complicated menus, pushbuttons and easy to read LED display make using the DRT-1 and MDT-1 easy. The DRT-1 has been designed to control pumps or other devices that must be activated on a repeating cycle. The DRT-1 replaces other single-function timers and it offers a extremely wide range of time delays. The DRT-1 is a 100% DIGITAL recycling timer. Allows the user to set the ON & OFF times in hours, minutes & seconds. No complex menus, single function pushbuttons for ease of use. Photocell allows daytime, nighttime or 24-hour operation. Two receptacles control up to 15-amps of power. Memory backed up with lithium battery. Re-settable circuit breaker built