The Black Diamond Iota headlamp is a light that easily fits in the palm of your hand. The Iota is the daily driver for quick-hit morning trail runs, post-work ridge scrambles and urban adventuring. Emitting 150 lumens on the max setting with an average three-hour burn time, the lithium ion rechargeable battery eliminates waste, and an IPX4 rating protects against splashed water from any angle. Powertap Technology allows for fast, easy brightness adjustments, and a lockout feature safe guards your battery life. The Black Diamond Iota headlamp features: 1 DoublePower LED with 150 lumens (max setting) projects a strong, oval beam Powered by a lithium ion rechargeable battery (TK-hour USB charge time) Settings include full strength, dimming and strobe PowerTap Technology allows fast and simple transitioning between full and dimmed power in order to instantly increase illumination in distance or proximity modes Three-level power meter shows remaining battery life for three seconds after switching on headlamp Lockout feature safe guards against accidental use when stored in a pack or pocket Protected against splashing or sprayed water from any angle (IPX 4) Brightness memory By default the Black Diamond Iota headlamp turns on at 60% power, however it has a brightness memory that remembers your preferred brightness level so it always turns on at the right level. The following video shows how to set the brightness memory: Specifications Brightness (lumens) 150 lumensWeight with batteries 56 grams (1.9 oz)Maximum light range 40 metres (at high setting), 7 metres (at low setting)Maximum burn time Approx. 40 hours [low], approx 22 hours [average] , approx 2 hours [high]IPX rating x4LED type 1 TriplePowerBatteries Rechargeable lithium ion (USB rechargable) The Black Diamond Iota headlamp is available in four colours: black, denim (blue), octane (red) and saltwater (green)