Bushnell PowerSync 20-watt-hour Portable Li-Ion USB Power Charger Quality optics with stunning HD clarity 100 percent quality materials used and tested extensively Beautiful design and durability built to last High capacity, highly portable 20 Watts/hr Lithium Ion battery charger Easy to read on board battery level indicator Handy field light for nighttime use Battery charges from a USB power source in 8-hours using included USB/Micro-USB cord Dual USB outputs compatible with nearly any USB powered rechargeable device