There are altogether 8 grids on the knob at the bottom,and each represents 0.2V.S
pin the knob in a clockwise direction to increase output voltage and spin the knob in an anticlockwise direction to decrease output voltage.
Higher output voltage gives more vapor.You adjust the output voltage so easily and enjoy the whole vapor time.
Following are test result by certain conditions:
1.2.2 resistence atomizer heating element.
2.4.8V battery output
3.Each puff last 4 seconds.
4.5 seconds between each puff.
5.Testing without stop until battery finish.
Bulk order discounts also available for many of my listings
Available in 5 pcs 10pcs etc... please see my other listings.