Glove-Friendly Rechargeable Headlamp. Micro-USB Rechargeable and lightweight, the Princeton Tec Axis Li is an intuitively designed, glove-friendly rechargeable headlamp. Its ambidextrous design allows the unit to be oriented with the controls facing left or right for access to all four modes, inducing red modes for preserving night vision, and dimming with either hand. This headlamp is fueled by a sealed lithium rechargeable battery, charged via a micro USB port, and features digital lockout to prevent accidental activation.