For Mini Tank:
Mini Tank only has 1 temperature setting and the preheat setting is 3 clicks.

For Viper:
Click the button below the digital indicator. The higher the illuminated bars are the higher the voltage.

For Nitro2:
Click the “R” in the middle of the pen 3 times to switch between temperature settings. The color of the button will change to green (low), blue (medium), or red (high) for the different settings.

For Cyclone:
Click the “R” in the middle of the pen 4 times to switch between temperature settings. The color of the button will change to green (lowest), blue (lower), purple (medium), red (high) for the different settings.

For Thunder:
Click the button in the middle of the pen 3 times to switch between temperature settings. The color of the button will change to white (low), blue (medium), or red (high) for the different settings.