Dual Pre-heat Operation:
Cartridge Pre-heat Mode - Heats from the coil up. During the first 1-15 seconds, the cartridge preheats at 1.5v represented with a pulsing BLUE LED.
Shell Pre-heat Mode - Heats the entire cartridge simultaneously. During the remaining 15-45 seconds, the shell of the battery preheats at 1.2v represented with a pulsing GREEN LED.
***Cartridge sold separately***
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