Lighted short beer mug. Drinking a pint has never been as fun with this light-up beer mug. These flashing mugs are fun when having friends and family over for get togethers. Make them a part of your nightlife, and let the good times roll! They have an On/Off switch located at the bottom of the mug that activates the glass. Once activated, the glass will begin to show off its 6 bright flashing LEDs.