Premium Material and Exquisite Size Neon】:Neon Happy Birthday signs are made of colored silicone strips and strong transparent acrylic plate.The size is 16.5"*12" (42*31CM) . ✔️【Dimmer Swith】:LED Neon Lamp light with brightness dimmable feature.You can adjust the brightness with "+" or "-"buttons. ✔️【USB Power】:LED birthday decorations powered by USB which connected with low power of 5V.The Cord length is 75inch(1.9M). Low energy consumption and long lifespan. ✔️【EASY TO INSTALL】:Happy Birthday party decorations comes with 4 hanging holes and two 40cm hanging chains.Used against a backdrop, chain supplied to hang.