With the Sony WH-H900N, you'll experience complete mobility while you're listening to detailed sound. Wirelessly connect these headphones to a smartphone or laptop via Bluetooth. When the battery is fully charged, you can enjoy music continuously for up to 28 hours. Do you use the headphones on the go? Switch on the adjustable noise canceling function, so sounds from outside are muffled. This way, your music isn't disrupted by the sounds of moving trains or an airplane engine. The frequency range of 5 to 40,000Hz ensures a detailed sound reproduction. Both the lowest as well as the highest tones of a song are clearly reproduced.