Big D® THE P.O.D. (PASSIVE ODOR DISPENSER) is designed specifically for small confined areas. It utilizes a solid refill cartridge (sold separately) in a handy, adjustable passive dispenser which attaches to any surface with pressure sensitive adhesive backing (included). THE P.O.D. locks to prevent tampering, and opens with a special key. To neutralize odors, THE P.O.D. can be placed in cars, boats, closets, bathroom stalls, etc. It may also be used in forced-air heating registers to provide a fragrance throughout the house or office. THE P.O.D. requires no batteries or electricity to operate. THE P.O.D. REFILL will keep any small area smelling fresh for 30 to 45 days (sold separately).