1. You can replace the battery. A battery to four batteries can be used, but also to remove the battery to continue using the flashlight. It is a mobile power, and 18650 is a battery charger, a dual-use. Province to buy the charger cost, very cost-effective. 2. adapt 18650. Built-in four separate lines, different brands, different capacities, different capacity batteries can be used together in the machine. Compatibility can be very 3. LCD. 5 grid segment display, grasp the remaining capacity situation at any time. Each and batteries are independent display, clear and intuitive. Also with 1A, 2A output indication. 4. reverse polarity protection. When reverse battery, the machine will automatically identify the chip inside, and cut off the power to reverse that way, the display shows an empty battery. Reverse does not affect the normal operation of other lines. 5. bad battery detection. When placed in a bad battery, the machine will automatically identify the chip inside the battery is good or bad. If a bad battery, the screen displays an empty battery. As shown. 6. With switch, two output ports. Press the power button to switch, charging short press the power button turns off the screen lighting and improve efficiency. 2A outputs to charge your tablet, charging more than two output ports to meet demand. 7. Connect the phone, the power is automatically turned on. 40 seconds no operating power is automatically shut down. 8. The application of any size 18650. Positive contact head protruding design, adaptation flat or pointed battery. Negative spring design to adapt with protection board and without protection board battery. 9. Enter 5V / 1.2A (maximum) output 5V / 2A 5V / 1A (max) can be displayed on the display 10. Manual charging accessories line-