IFeng 3.5mm Plug Surveillance Listen Only Earpiece for Two Way Radio Transceivers Speaker Mic Listing Only Earpiece---3.5mm surveillance plug receiver/listen only audio earpiece for 2 way radio Earbud Protection---Air acoustic tube protects your body by reducing radio waves radiation. Soft Earbud---Earbud fits snugly to ear, which keeps your conversations private Suitable Satuation---Great for use in ATVs, skiing, car racing, the Racing game, Security, surveillance and noisy environment. Compatible for---Any model radio come with a 3.5mm mono jack.