Time-R Digital Timer The Time-R digital timer has a large easy to read screen, a grow room friendly green back lit screen and an easy to use cross button for programming. This is just scratching the surface as the Time-R has many features never before seen on a timer…. until now. The Time-R operates like a normal timer but has a multitude of other options for controlled switching that go down to one second intervals if needed. If you want to run a fan/pump with different settings at night, or you want to dispense CO2 using precise dosing at particular times throughout the day, the Time-R has you covered. 3 Modes: Timed Mode - Set precise on and off times, up to 15 times a day. Repeat Mode - Turn your equipment on and off at regular intervals, from 1 second and up to 99 hours. Combined Mode - Using this mode allows you to run your equipment on and off repeatedly at set intervals throughout a 24 hour period. Maximum 3 group settings. Features: Green Back Light Large LCD Display Built-in Rechargeable Battery Heavy Duty 30A Relay Button Beep Option 12/24 Hour Options Repeat/cycle mode Minimum settings of one second