NOTE: Please measure and confirm the size of the bulb in your insect killer before purchasing. For Black Flag, Flowtron, Gootop, Fvoai, Klahaite, Hemiua, Stinger, Luojibie, Endbug, Dunaga, Jawlark, Tysonir, etc. EFFECTIVE: This 15W UV lamp emits blue light with a wavelength of 365nm, attracting mosquitoes, gnats, moths, and other flying insects to the device. LONG LIFESPAN: The replacement bulbs can last up to 3,000 hours (4 months) of continuous use. You will receive 4 insect killer bulbs. AFTER PURCHASE: The light tube is fragile. If it is broken or not working, please contact us for assistance. Color: White Material: Glass Package Contents: 4 * Insect Killer Replacement Bulb Only the above package content, other products are not included. Note: Light reflections and different monitors may cause the color of the item in the picture to differ slightly from the actual item. The allowed measurement error is +/- 1-3 cm.