The E-Max Pro BT are newly designed from Caldwell featuring high quality Bluetooth hearing protection with an all-day comfortable fit all at an affordable price. These E-Max are Bluetooth compatible with mobile devices and have a 24dB noise reduction rating. With high quality stereo sound and easy to use push button volume controls, you can listen to all your favorite music while on the range. Runs on Caldwell's Rechargeable Lithium Ion Battery (included) or AAA batteries.