Vandora HS2 KM-002-E6 Solar Panel, Big, White DUAL CHARGING DESIGN:The charger can measure the true capacity of the battery.Also it can increase the charging speed by 35%, increase the output rate by 10%, up to 97% conversion rate. TRUE CAPACITY,NEVER FALSE: Each batterys capacity is 1600mAh/11.84Wh , it will take about 4 hours to fill two batteries. FOUR WAYS TO POWER UP:Ploture features wall, car, computer and power bank charging for added convenience. FEATURES SIX LAYERS OF PROTECTION:Q8 smart chip has over-current, over-charge, over-discharge, short-circuit, anti-reverse, stable six protection functions, safe charging. 100% Safety Guarantee: 30 days money back and worry-free customer service guaranteed.