Brand New without box Noise reduction rating SLC80 29dB or higher when worn properly Performance tested to AS/NZS 1270. Class 5 Equipped with 40mm high fidelity speakers for premium sound quality Built-in rechargeable battery; charging cord included Hi Fi sound, bluetooth, call connect capability and MP3 compatible The next generation in WorkTunes hearing protection and entertainment, the 3M WorkTunes Connect Wireless Hearing Protector with Bluetooth Technology combines a modern, comfortable design with hi-fi sound quality. This innovative hearing protection lets you conveniently make and take phone calls while you're on the job. Equipped with Bluetooth Wireless Technology, these ear-protective headphones allow you to stream the entertainment of your choice from your smartphone or other mobile device, while providing ear protection in noisy environments. The low profile and lightweight design is crafted with style in mind. Built-in comfort features such as soft ear cushions and a hat-compatible, low-pressure headband are excellent for extended wear. So whether you're using a shrill power saw or mowing the day away, reach for 3M WorkTunes Connect Wireless Hearing Protector with Bluetooth Technology for a triple-power approach to help make your workday more efficient, entertaining and most importantly safe.