Place the Expel Mosquito Lamp on a flat, stable area near to where you want enjoy the outdoor without the constant annoyance from mosquitoes. Use one Expel Mosquito Lamp in an area as large as an average size deck or patio ( 15' by 15' ). Use two or more Expel Mosquito Lamps in larger areas. Use one Expel Mosquito Lamp in an area as large as an average size deck or patio ( 15'by 15' ). Use two or more Expel Mosquito Lamps in larger areas. The Expel Mosiquito Lamp works well in outdoor areas where there is minimal breeze such as decks, porches, patios, yards. Do not remove plastic post from the base. Extreme wind, heat, humidity may Affect the performance of the Expel Mosquito Lamp. To Change Pad & Candle: Pad and Candle should be changed at same time. Pad and Candle are specially designed to work together for up to 4 hours. Product Size: 13 cm Dia. X 20. 5cm H The Product made of Durable plastics; Packing: White mail box: 13. 5 x 13. 5 x 21CM; Carton: 42 x 42 x 44. 5CM; 18PCS/CTN; N. W.: 3. 6KGS; G. W.: 6. 6KGS 1 x 20'/365CTNS/6570PCS; 1 x 40'/ 740CTN / 13320PCS; 1 x 45'/968CTNS/17424PCS