Princeton Tec Apex Extreme APXR-EXT-BK Head Torch- LED - AA - BlackThe Apex Extreme is taking cold weather explorers, cyclists, climbers, and backpackers to new heights. The Apex Extreme providesthe same ability and power as the original Apex, but stores its batteries in a remote compartment that can be clipped close to your body for optimal battery warmth and usage in cold temperatures. In addition, the external battery pack reduces the weight on your head. Having the longest burn time ofthe Professional Series, the Apex Extreme is perfect for winter months when the nights are longer and the temperatures are dropping.