["Make the Invisible Visible: 395nm wavelength can help to detect what naked eye can not see like dog urine/stains authenticate currency drivers license passports customs or gas leak inspection. 2 pack blacklights sufficient to meet your needs for daily activities and also great to share with others." Time & Money Saving: No need to clean the entire carpet use this flashlight to detect the exact location of the statins or urine it will point out the area for you to clean greatly save your time and money. Compact & Portable: Each blacklight measuring 3.7’’ x 1.13’’ and 1.8oz. It’s ultra-lightweight and portable you can keep in your pocket or at home or elsewhere. Small gift but great help perfect for your friends colleague and pet-lovers. Brighter Black Light: High quality Aluminum alloy material make it strong enough to withstand heavy use. Upgraded texture designed to prevent sliding and improve using experience. The 12 pcs UV bulbs emit brighter light and last longer than other 9 pcs UV bulbs. The flashlight uses 3 X AAA batteries(not included)]