If some lights are not bright by twisting easily the base, it may not be a quality problem, please twist with more strength. If the lights still do not work,please dismantle and install them,then try to twist them!
48 x Waterproof Colorful Blinking Balloon Lights
Colorful，Waterproof, blinking lights
use to illuminate the inside of a paper lantern or balloon
Great For Wedding Decorations, Party Supplies, Or Floral Arrangements.
changes the color automatically in seconds
1-1/4 Inch in Length and about 1/2 Inch in Diameter，Batteries Are Included