Operates with a 3.7V battery (included) and is powered by the USB port.. It has a strong lighting intensity reaching up to 400lm. Due to its magnet, it can be attached to metallic surfaces and facilitate you in various tasks. It has auxiliary ultraviolet (UV) for authenticity verification (e.g. money, identities, passports, authenticity marks, etc.) and activation of fluorescent materials. The weight of the reaches 0gr.