http://www.newnow.com/products/newnow-mars-i-10000mah-external-battery-for-iphone-5-htc-samsung-s4.html
* Over charge protection.
* Over discharge protection.
* Over voltage protection
* Over current protection.
* Over load protection.
* High temperature protection.
* Short circuit protection.
* PCB charging protection and MCU software ensure safety.
* Smart circuit control technology enables it charges automatically once connected.
* Meet with a variety of FCC, UL, CE and RoHS certification.