Specifications: Strong in UV, but not strong in visible light. Great for checking notes, credit cards, fluorescent inks (invisible inks), cracked glassware, or even crime scene. The body is built of high quality aluminum alloy, and it has a very solid construction. Internal wiring applies the high efficient booster circuit, and can utilize the batteries in the largest extent. Type: UV Flashlight Material: Aluminum Alloy Emitter Type: UV LED Wave Length: 365 - 400nm Bulb Quantity: 9 Battery Configuration: 3 Pcs AAA Batteries (NOT INCLUDED) Input Voltage: 4.5 V Runtime: About 6 - 8 Hours Switch Type: Pushbutton Tailcap E-switch Lens: Coated Glass Lens Dimensions (L x Head Dia. x Body Dia.): 8.7cm x 2.6cm x 2.6cm/3.43"x 1.02" x 1.02" (Approx.) Notes: Due to the light and screen setting difference, the items color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Included: 1 x Flashlight Torch