The E-Max Power Cords are Bluetooth ear plugs that allow you to listen to your favorite music on your mobile device all while protecting your hearing on the range. Complete with high-quality stereo sound and a corded design that keeps them together, these plugs are rated with a 22dB noise reduction rating. Features Include: 22 db NRR (noise reduction rating) Battery Life: 6 Hours per charge Micro USB rechargeable Bluetooth pairing with phones or other capable devices for music or phone calls Adjustable ambient sound amplification Multiple ear tips included Great for other noise reduction such as lawnmowers