Product Description:   9 LED 1 Mode UV blacklight flashlight Long service life up to 10,000 hours Aluminium body, light weight Great for checking notes, credit cards, fluorescent inks (invisible inks), cracked glassware, or even crime scene LED Qty : 9 ultra bright LEDs Switch: Tailcap Click On/Off Voltage: About 3.6V - 4.2V WL: 395-400 nm Power: 3x AAA battery (not included) Size: 8.8cm x 2.5cm x 2.5cm - 3.45inch x 0.98inch x 0.98inch   12 LED 1 Mode UV blacklight flashlight LED Qty : 12 ultra bright LEDs Switch: Tailcap Click On/Off Voltage: About 3.6V - 4.2V WL: 395-400 nm Power: 3x AAA battery (not included) Size: 95mm x 30mm x 30mm   21 LEDS UV Bulbs/mode: 21 LED UV Purple Light WL: 395-400 nm Material: aluminum alloy Battery: 3×AAA (not included) Switch: Tail clickie On/Off Color: black   51 LEDS UV *Bulb Type: 390nM to 395nM *Bulb Life: 100,000 Hours *Body Material: Aluminum; silicone O-rings for water resistance. Voltage:4.5V Material:Aluminum Alloy Runtime:4-6 Hours on Full Battery Battery:3xAAA Standard Alkaline Battery (Not Included) Compact, High Quality Design. The strong Aluminum alloy body makes this product durable and long lasting, and the large head with 51 LED makes this flashlight brighter than others products. The Pocketman Advantage Like all ofPocketman's products, the UV Tracker 51 is built to last with a rugged aluminum construction and high-quality UV LED bulbs with a lifespan of about 100,000 hours.