Top features:- Listen to your music without wires for up to 30 hours – Take hands-free calls from your smartphone – Behind-the-neck design for comfortable all-day listening Listen to your music without wiresEnjoy your music without the hassle of tangled wires. These Sony WI-C400 Wireless Bluetooth Headphones pair with your smartphone, tablet, or other compatible Bluetooth device for a cable-free experience. Or if you have an NFC-enabled device, just tap the two devices together to pair. A battery life of up to 30 hours provides more than enough power for all-day listening.Take hands-free callsA built-in microphone means you can take incoming phone calls hands-free. A vibration notification lets you know when a call is coming through.Behind-the-neck designThe behind-the-neck design is shaped for comfortable all-day listening. When you’re not listening to music, you’ll barely notice you’re wearing the neckband.