National Geographic 4-Port Drone Charging Station with TWO Extra 3.7V 750mAh Lipo Batteries! Charge 4 Batteries at Once! Charge up to 4 batteries at once so you don't have to wait. Get the most flight time possible for your drone quadcopter! USB charging which includes over charge and short-circuit protection Includes TWO 3.7V 750mAh LiPo Batteries and one 4-Port Charging Station with USB A male to Micro B charging cable Works with LiPo batteries used in the National Geographic Quadcopter Drone as well as Holy Stone, MJX, and other compatible Drone models (Check battery specifications) Respected Quality - This charger comes with National Geographic's 100% satisfaction guarantee so that you can make your decision with confidence