Features: Radiation resistant: Air sound tubes protect your body by reducing radio wave radiation. Anti-noise: The earplugs can firmly fit your ear, and it can transmit clear sound through the air sound tube even in noisy places. Hidden: Transparent sound tube headphones can be invisible by switching to the similar with the surrounding environment. Ideal for use in ATVs, skis, racing, racing games, security, surveillance and noisy environments. Compatible with most CB radio speakers and microphone with 3.5 mm mono jack. Specification: Type: Walkie-talkie Earphone Material: ABS Plug: single 3.5mm / 0.1in Line length: 50cm / 19.6in Package List: 1 * Headphones 1 * Air duct 1 * Replace earbuds