Portable Acrylic edge backlit sign

This is a fun-present for one of our neighbour-friend for his 50 year anniversary.
Though he doesn't know Polish, he likes to greet everyone with "Zapraszami do Bufetu" (his way of inviting guests to the liquor bar).

So the idea vas to make a rechargeable portable edge-backlit sigh which can be used indoors or in his gazebo which could work for the whole evening (works 4 to 5 hours of the full charge). Battery is charged over the micro-USB using a phone charger.

It uses the Panasonic NCR1