Pull the diffuser out of the el. the socket, remove the empty bottle. Remove the cap. Insert the bottle into the electric air freshener until you hear a click. Be careful not to damage the wick. Insert the diffuser into an electrical socket. Leave 50 cm of clearance around the socket during use to ensure good evaporation. Adjust the strength of the Fragrance. Lasts 75 days with 12 hours of daily use and a Fragrance strength of 2.