The Walker’s Silencer electronic ear buds provide all day comfort and customization with the patented secure fit system. Delivering crystal clear digital hearing enhancement. The silencer also protects hearing utilizing Walker’s sound activated compression technology. Form meets function, all in a compact lightweight in-the-ear design. The Silencer Ear Plugs are not rechargeable. Moreover, the Ear Plugs will use a low portion of battery power even when turned OFF. Left & Right Ear Buds. Secure Fit fitting system. Sound Activated Compression protects hearing. 80 Hour Battery Life. Integrated Omni Directional Microphones. Full Dynamic Range Speakers deliver crisp clear sound. Includes foam ear buds (S, M, L). Secure Fit Sizing fins (S, M, L). Powered by #10 Batteries – 4 included.