【Bulb size】13L x 1W x 1H inch, total length including pins on both sides is 13.5 inch. 【Applicable models】FSL BL T8 F10W insect killer replacement bulb is compatible with most 20W electronic indoor insect killers, such as Asp-ectek, Li-Ba, Micn-aron, lu-lu home, etc. 【Function】The power of one replacement light bulb is 10W. 【Effect】Professional 365-nm wavelength and UV black light. 【Packing quantity】Contains 2 electric bug zapper replacement bulbs in a box. 【Lifespan】In order to achieve the best working effect, it is recommended to replace the T8 10W UV light bulbs in about 3-4 months of continuous use. 【Fragile reminder】The light tube is fragile, if it doesn't work or is broken caused by shipping, please contact us to get new replacement. 【Warranty】We offer 100% satisfaction service with 90 days free return and 7/24 hours after-sales service support.