This Jackery Portable Mini External Battery Charger is the smallest of portable chargers in the market today. It's dimensions are as follows; 3.7 x 0.9 x 0.8 cm and weighs only 2.72 oz. You can use it to put a full load of your iPhone, iPad or Android device. It is compact, portable and very stylish and perfect to take with you on long trips on the road in an airplane, or anywhere you may need to charge more than just equipment. It uses Panasonic Assign to create A Li-ion cell and premium microchip, a high-quality portable charger with 4 layers of intelligent safety protection circuit and provides more than 500 charging cycles over the lifetime of the battery this device you use to connect the unit, as Your USB cable smartphone or tablet in the Jackery mini, then in contrast to the larger devices of Jackery this device did not start on its own, you must press the power button to start or stop it.-unit automatically off, if no load within 30 seconds found. In this way prevents accidentally turned on and the power light as drained.-The blue status bar when the power button is pressed, they will go out after 10 seconds, even if the USB port is still switched on. This is in order to save energy. If you find out the battery status, simply press the power button again. Battery status flashing There are 4 blue LED lights, which show how much energy in your battery to the left - 4-LEDS-80-100%, -3% -2 LEDS -55-79-LEDS-25-54 %, -1-LEDS-10-24%, flashing-0-9%. The total charging time when the battery is empty for about 3.5 hours. -My Opinion of Jackery portable Mini is that it's a very well designed product that does exactly what it should do, and not what you pay your money for hardware! I know I am. It may be small, but it is big enough to hold a full charge is to pack for your smartphone or tablet. So I definitely recommend this product. - * Jackery provided me with this product at no cost so I could test and an unbiased review of this product. All opinions are 100% my own.