Designed as an emergency light but so handy, you probably won't wait. At 28g and about the same size as the end of man,s thumb it's easy to slip in a pocket or carry in a bag so there's no excuse for leaving it behind and getting caught in the dark. It's designed to work when you need it with a 10 year battery storage life, water and dustproof case and very wide temperature range. And when you do need it you can shine the light where you want with a retracting cord for wearing on head or arm and with ball joint clip that allows it to be fastened to a pocket, collar or bag or even stood up. The e+Lite has three white light settings including flashing and for preserving night vision or as a cyclist's emergency rear light, there are two red light settings including flashing. Up to 70 hours light from one set of batteries and up to 29m range.