NOTE: Please measure and confirm the bulb size of the bug zapper before purchasing. for black flag, for flowtron, for gootop, for fvoai, for klahaite, for hemiua, for stinger, for LUOJIBIE, for endbug, for dunaga, for jawlark, for tysonir, etc. EFFECTIVE: This 15W UV lamp which emit 365nm wavelength blue light, attracts mosquitoes, gnats, moths, and other flying insects to the device. LONG-LASTING: The replacement bulbs can last up to 3,000 hours (4 months) of continuous use. You will receive 4 bug zapper bulbs. AFTER-SALES: The light tube is fragile. If it is broken or non-functional, please contact us for assistance. Color: White Material: glass Package Contents: 4 x Bug Zapper Replacement Light Bulb Only the above package content, other products are not included. The measurement allowed error is 1-3cm.