Draw through the opening at the top of the pen. Light will glow at the opposite end when in use. Each draw is 2mgs of CBD. Take 2-3 draws per day or as needed. Light stays solid during 5 seconds of draw and blinks 5 times to signal the heating element has turned off, as intended. Light blinks 10 times upon draw to signal that the battery is dead. Light does not illuminate when the battery is completely dead.