Acmee&reg; Mini Non-blinking LED Party Light for Balloons or Paper Lanterns (White, Pack of 20) Flashing balloon lamp, all you have to do is switch them on and put them into your balloons, before you blow Turn LED on and off by twisting the base With a hook a bottom, you can thread and hang them easily Batteries: 3 x 1.5V LR41 in each led, 8 hours+ (yes, batteries are included) Waterproof, blinking lights