The SDB HD9-RGB is our newest model wireless headphone. It is a robust headphone made of metal and plastic. The headband is covered with rubber for optimal wearing comfort, even for young children. Due to the collapsible construction, the headphones can be stored easy, which benefits transport. Like other Silent Disco Box products, these headphones also operate on 3 frequencies, The choosen channel is made visible by means of color LED light in the ear cup. Each headphone is equipped with a power switch and a volume control. The headphones are powered by a built-in rechargeable battery that can be charged by a charger (to be ordered separately).