There's a small light on the top of the battery part—green means good to go, white means it's in use or is being charged.
The JUUL delivers nicotine with only the use of vapor. The battery life is signaled by a flashing light which is activated when you tap twice on the JUUL.
- A green flashing light means high charge.
- A yellow flashing light means medium charge,
- And a red flashing light means low charge.