Six pre-setting modes:

M1: Temperature 290 °C
M2: Temperature 300 °C
M3: Temperature 310 °C
M4: Adjustable temperature from 220 °C to 370 °C
M5: self-clean fuction
M6: Adjustable working times from 210 s to 390 s

Turn on/off device by 5 click main button.  insert the tobacco cartridge, and then pressing the main button until you feel the Bess shake,  it meaning the coil is heating now, also you can see the screen show the temperature is changing to your pre-set, meanwhile the device will shake again, that means Bess finished heating. Enjoy vaping now…