Bluetooth Headphones 14Hr Working Time, Truck Driver Bluetooth Headset, Wireless Magnetic Neckband Earphones, V4.2 Noise Cancelling Earbuds W/Mic, Compatible With Any Bluetooth Equitments (Blue)With MSDS certificate for the batteries, and over 14 hours non-stop working time.2.HD VOICE & NOISE REDUCTION. Bluetooth 4.2 with Jelee 8634 chip.3. SWEATPR..