Features: Charge two batteries simultaneously and independently. With high capacity up to 1400mAh, support for long time using. Overheat protection and overcharge protection. High quality design, more durable. Premium lithium ion cells, new rechargeable battery pack. High energy density , extra long life, memory free. Soft-start function to avoid damage from large charge current while charging. Descriptions: Extra power, more shots for your cameras. Prefect for travel and home use, portable and convenient to carry. With a micro USB cable for easy charging. Specifications: Battery Type: Lithium battery Battery Capacity: 1400mAh Battery Voltage: 3.85V Battery Size: 3.5*3.2*1cm Battery Weight: 24g Output:4.2V 800mAh(x2) Input: 5V 2A For XiaoMi YI 2 II 4K Package included: 2 x Battery 1 x USB Dual Charger 1 x USB Cable Notes: Please allow 0-2mm error due to manual measurement, thanks for understanding. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Please understand, thank you!