Is there a battery in the light or do you plug it in?

Sorry, mine does not have a light

Will it work as an additional rail at the bottom of a hospital bed?

Yes. It would work wherever you place it. It slides under the mattress.

Does this work with an adjustable frame bed?

It works great with my adjustable bed. I have a California King Bed. I bought a second one for the other side of the bed, because I like to switch sides. Only thing bad I can say, but it's minor thing, the bag that comes with it snaps on. I have one snap that will come undone. I just have to be careful not to put anything a little heavy in the bag.

Brand	Agrish
Model Number	12011
Colour	Dark Grey
Product Dimensions	5.05 x 101.6 x 60.96 cm; 2.72 kg
Item Weight	2.72 kg

Agrish Bed Rails for Elderly Adults - Bed Assist Rail with Support for Getting Out of Bed, Bed Guard Rail with LED Light & Storage Pouch, Fits Single, Double Size Beds

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