Multifunctional charging case: 4 battery(0.7 inches in diameter - 2.56 inches long) charging case, LCD display battery voltage and current value, the remaining battery power. Can easily remove the battery to power other devices Mobile power function: filled with batteries, it is a 10000 mah rechargeable treasure (choose 4 2500 mah batteries), if you choose 3500 mah / a battery, it is 14000 mah rechargeable treasure. Not recommended, different sizes of batteries loaded into use at the same time Dual-port input: (MICRO and TYPE-C) 5V-2A, two USB output, 5V-2A, long press the switch can open the flashlight function Bad battery detection function: if you load a bad battery, or the battery positive and negative poles are installed backwards, no battery symbols on the LCD display, only normal batteries appear battery symbols Concern: This product does not include batteries, unfamiliar with Cylindrical lithium batteries, people without DIY spirit, please be careful to buy