The Moon Aerolite Helmet Light is a great light if you are finding yourself riding on the roads in the darker hours of the day. With one CREE XP-E2 Bright LED the light has a focused optical output and when attached to your helmet provides the most direct source of light. Charge at home or at work using the charging cable provided (Mini USB). This is ideal as most rechargeable electronics will use the Mini USB so if you forget your cable one day you'll never be within a few metres of one or someone that has one. Programmed with 6 modes you are bale to choose the most approx.[rate for the conditions you are in. The quick release and tool free mount makes for fast attachment and removal of the bike meaning you are able to swap between bikes with in a matter of seconds. A battery charging indicator tells you, when the light is plugged in, the capacity of the battery, Low battery charging and then fully charged. Once the light has fully charged the system will automatically shut off avoiding burnout electrics within the light. Overall this is a great light to own with versatility and ease of use at your finger tips.