Featuresr super bright 4 led lightsr one soft button with 3 modes flash in turn strobe and steady lightr can be powered by computer power bank or cellphone charging adapter via the usb cabler the light color of the button can indicate battery capacity yellow light means that battery is under charging and light off means full chargedr comes with a quick release elastic band easy to install and convenient to carryr lightweight mini size easy to hang on the backpack to be used as a war