Philips Fidelio X3 wired over ear open back headphones X3 00 Lexmark Secure connections with robust cable Secure connections with robust cable retention brackets Networking Cabling technology 1000BASE SX Data transfer rate (max) 1000 Mbit s Performance Wavelength 850 nm Maximum transfer distance 550 m Operational conditions Storage temperature (T T) 40 85 °C Operating temperature (T T) 0 70 °C Weight & dimensions Package height 65 mm Package depth 115 mm Package width 25 mm Weight 20 g Other features Interface Fiber Optic LC Compliance industry standards IEEE 802 soft inner headband adjusts to fit perfectly this high performance leather lends a sophisticated touch to the headphones