TimeWick Air Freshener Dispenser is completely passive & requires no power source to deliver 60 consistent days of premium air freshening. Essential oil releases into the dispenser reservoir at a steady rate, & the sintered polymer wick quickly absorbs the oil & releases the fragrance into the air. Small dispenser & refill offer a discreet fragrance solution. The tamper-resistant dispenser covers 3,000 cubic feet. It offers environmentally conscious air freshening, compared to products with batteries.