Helps protect workers from hazardous workplace sounds while making it easy to communicate, listen to music, or talk on the phone. Unique level-dependent technology helps improve awareness by boosting lower level sounds like voices, while limiting louder, potentially hazardous sounds. Ideal for anyone who enjoys listening to music in high-quality stereo sound and needs the ability to communicate via a wireless Bluetooth® phone while in noisy environments. Bluetooth connection controls on the left side of the headset make it easy to accept or reject phone calls. Music is automatically reduced during phone conversations and resumes when a call is completed. Included cable can be used to connect devices such as MP3 players or 2-way radios. Headset runs on (2) AAA rechargeable NiMH batteries.