Advanced system with "Command Performance," lets you customize usage. Set start/stop time, plus spray level (light, medium, heavy). Or, set switch "ON" for automatic spraying every 15 minutes, 24 hours a day, for 30 days. Visual (LED) and audible (beeps) refill and battery replacement indicators. Operates one year on two C batteries (not incl.). Mounting screws included. Manufacturer's lifetime warranty when used with TimeMist® refills (sold separately). 3¾w x 3¼d x 9½h.