1.Inner smart Buck-Boost converter--output voltage can be adjusted from 3.2v-4.8v,you can choose the voltage by spinning the knob at the battery
 

2.short-circuit protection-when short circuit,the battery will shut down.The battery wouldn't go back to work untill the ends of circuit.
 

3.switch protection-press the button 5 times within 1.5 seconds,lock/nonlock
 

4.Atomizer protection-if you press the button for by 10 seconds,the battery will be locked untill the next press.
 

5.Low voltage protection-when the battery voltage is lower than 3.3v,the battery will shut down.
 

6.charge-white led blinks 5 times,ego usb charge can be used.