They can be put in a glove compartment and forgotten, as they are powered by AA batteries which last for years.

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She took his bottle from the glove compartment for a single, long pull.

NPR: Excerpt: 'The Assassins Gallery'

Those living in flood-prone areas might want to consider carrying a small hammer or specific car window-breaking tool in the glove compartment for this purpose.

FORBES: What To Do If Your Car Is Flooded Or Becomes Submerged

The USB Music Box consists of a USB socket, which can be placed out of sight in the glove compartment, centre console or armrest.

ENGADGET: Ford USB Music Box adds mass storage playback, smartphone charging to AUX-enabled receivers