Wireless Headphones feature Bluetooth technology to provide an enhanced listening experience without being plugged in. Long battery life gives you up to 12 hours of play or talk time. Boom-style microphone allows hands-free conversations on the phone. Adjustable, slide headband provides a customizable fit for most users. MicroSD card slot allows you to insert your card to listen to songs without the need for a device. It includes a micro USB charging cable, FM radio function (frequency 87.5-108.OHZ) and backup 6' cable with a 3.5mm plug. Headphones are compatible with all wireless supported devices.