FreeFly Rechargeable Ultralight Headlamp, Mini-USB Rechargeable, 75 Lumens, Red Night Vision Lightweight. Only 1.6 oz with included Li-Ion battery Rechargeable. Mini-USB charging port and included cable can be connected to any USB port. Night Vision. Red LEDs are great for around camp, use minimal power, and maintain your night vision because your pupils will not constrict like they do in response to white light. Comfortable. Adjustable headband and minimal design--you might forget you have it on. Long Lasting and Efficient. 3 different levels of white light, plus the red LEDs means you can select just the right amount of light and conserve battery power.