Type A(short battery)
Type B(long battery)
Silver, Black, Purple, Blue
Short-circuit Protection: When the output resistance is lower than 1 ohm while smoking, the LED will long light (lasts two seconds) to stop outputting.
Low-voltage Protection: When the voltage of battery is below 3.1V, the LED light will successionally blink ten times to stop outputting.
Charge it by USB port.
Overcharge Protection: When fully charged to 4.2V, it will cut off the charging circuit automatically.
Catomizer Protection: When you vapor over 5 seconds, the LED light will successionally blink two times to stop outputting.