The Time-R digital timer has a large user-friendly screen and a grow room friendly green backlit screen to ensure no grow or bloom light cycle interruptions and an easy to use cross button for programming. This is just scratching the surface as the Timer 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, these crucial functions make the Time-R digital timer one of the best automated switching devices on the market today. Timed mode: Set precise on and off times, up to 15 times per day. Repeat mode: Turn your equipment on and off at regular intervals, min. from 1 sec 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 Built-in Rechargeable Battery 12/24 Hour Option Large LCD Display Intelligent Button Design Button Beep Option Minimum One Second