MODEL 2000 - 5, 15, 30 MINUTE INTERVAL SETTINGS, LIGHT SENSOR FOR OFF WHEN LIGHTS ARE OFF. ALL MODELS HAVE CHEMICAL RESISTANT PLASTIC CONSTRUCTION, A RED USAGE INDICATOR LIGHT FOR 3,000 ACTUATED SPRAYS, A KEYLESS PRESS AND RELEASE BUTTON FOR CONVENIENT REFILL, A CAN OUT REMINDER AND AN ALKALINE BATTERY LIFE OF 1 YEAR (SPRAYING AT 15 MINUTE INTERVALS 24 HOURS/DAY, 7 DAYS/WEEK, 52 WEEKS/YEAR).