Switches on and off automatically. Easy set-up using rotary knob. Up to 3 watering programmes per day. Watering time stepped from 1 – 180 minutes. Water Timer operates for approximately 1 year with 1 x 9V alkaline batttery 6LR61 (not included). Control unit can be removed for programming. Manual on / off. Operating pressure 0.5 - 12 bar.