How cool is this little gadget? Keep your phones, tablets, blue tooth speakers, Go Pro cameras and other portable usb devices charged and non the less at the flying field and on the go, on the bus or airport at the park or anywhere you are. Never worry about having to plug into an outlet again with this cool tiny device. I have tried it with 3s, 4s and 6s, this thing charged my iPhone and iPad with ease. I prefer my self using 3 or 4s lipos, cause that's what i have. I put in series two 3s to test its function and it works on 6s as well. Great For Travel, Great for Emergencies like a power outage!!! Use your charged or storage charged lipos in case of emergency!!!!! Can also be used as a quick on the go, battery voltage tester, since it has a built in voltage display!! Supports 2S to 6S lithium battery lithium battery, output 5V, can charge any type of mobile phone. This gadget can be used to charge the mobile phones. Also can charge the Tablet PC and a variety of battery backup devices (such as cameras, Bluetooth headsets), can be used as USB portable lamp power supply. In hot summer, can supply power to the USB fan, USB Light and Many other Devices. . Specifications: Input: 2S-6S Output: 5V-2A The weight of about 10 grams Connector Type: XT60 plug or Deans, Chose your Connector Output interface: Standard USB interface Size: 53mm*15mm*8mm