Take care of your hearing with the added feature of Bluetooth technology. Comfortable， padded， earmuff-style STIHL Dynamic Bluetooth Hearing Protection combines a noise-reduction rating of 24 with a wireless connection to your phone， so you can listen to music and receive phone calls as you work. The speaker sound level is limited to protect from hearing damage. The hearing protectors automatically pause music as the user receives a call. A convenient built-in microphone gives the user hands-free ability to talk， and an ergonomic， rubber-coated power button answers and ends calls， even if the user pushes the button with a gloved hand. Run time is up to 38 hours for audio streaming and the battery will last 100 hours on standby. Recharge the hearing protectors in just three hours with an included USB cable that connects to a computer， car or phone adapter. To protect from dust， sweat， and moisture， all electronic components are sealed in a separate compartment.