... 4. 4 led display the capacity 5. USB and Mini usb ports usb power bank for phone, camera, mp3, mp4, for ... : 2200mah With Micro USB port and USB port with led display to show the power comsumption Nice design, so ... that you can used portable battery seperately .You can used solar panel, USB charger and AC ... phone, camera , PDA , camera etc . very useful . usb power bank