How To Use Eleaf iJust 3

How to Use
Power on/off: press the button 5 times in quick succession within two seconds,
and the indicator light will flash 5 times to show the device is powered on. In the same way, it can also be powered off.

Vaping: keep holding the button to take a puff when the device is powered on.
When vaping, the indicator light stays lit.

Charging: the device can be charged by connecting it with 1A wall adapter or
computer via the USB cable. The indicator light is red during charging and goes
out when fully charged.

Properties and Protections
Resistance Range: 0.1Ω-3.0Ω

Atomizer Protection: every time when vaping time exceeds 15 seconds, the
indicator light flashes 10 times and the output cuts off automatically.

Short Circuit Protection: if short circuit occurs before vaping, the indicator light will flash 5 times and the output cuts off automatically when you start to vape; if short circuit occurs during vaping, the indicator light will flash 3 times.

Low Voltage Protection: when the voltage of the device is lower than 3.3V, the
indicator light flashes 40 times and there is no output when vaping. Charge the
device to reactivate it.