The Princeton Tec Axis Rechargeable headlamp shares a common platform with the alkaline-powered Axis. Employing a really clever user interface that allows direct access to any mode and ultimate flexibility through complete dimmability, this light has a surprise waiting just behind the battery door. Flip the door open to gain access to the industry-standard micro-USB port for charging. The built in battery power meter lets you know when charging is complete, and modern rechargeable battery technology means this headlamp will have a consistent output in a wide range of temperatures. Many people are thinking about switching to rechargeable headlamps for convenience, long term-savings on batteries and to minimize their impact on the environment. With the Axis Rechargeable, the bar was just raised.