The Claber Pratico water timer is simple to use and program. To set, it's as simple as pressing the green button at the time of day you want the watering to happen, then press the red button when a sufficient amount of time has passed (maximum 60 minutes). Once set, the water timer will repeat the program every 24 hours. The Claber Pratico Plus is powered with a single 9v battery, which lasts an entire season (roughly 6-9 months). All the electronic components are sealed within the unit and is rated for outdoor use.