With 4 programmable On Off settings in a 24hr. repeating cycle this timer allows devices to be turned on and off daily. Designed for simplicity, there are only 3 programmable buttons for simple step-by-step programming. The angled housing and large LCD screen makes the unit easy to read and operate even while plugged into an outlet. With the 30 minute Quick Charge feature the unit is rapidly ready for programming. Set the random mode option and the unit will adjust the programmed on and off timers by up to 30 minutes.