Bluetooth-enabled Hi-gain Omni-directional Microphones Sound Activated Compression Noise Reduction Rating: 31db HD Speakers In Earbuds Retractable Digital Earbuds Behind-the-neck Design Allows For Zero Interference With Weapon Auto Shutoff After 4 Hours Rechargeable 250mah Li-poly Battery Lasts Up To 10 Hours Includes 3 Pairs Of 12mm Foam Tips 2 Pairs Of 16mm Coated Foam Tips Ac Wall Adapter With USB Port & Micro USB Cord