This wireless Bluetooth headphones utilise Bluetooth 5.0 technology to deliver audio signal from your smart device or computer over a range up to 10M. Low energy consumption and reliable wireless transmission. There is also a TF card slot for playing MP3 files stored in a micro SD card and 3.5mm socket for connecting the headphones to an audio source with a 3.5mm cable. This earphones feature soft and comfortable earpads and adjustable length headband. It has a 40mm high quality Neodymium driver to deliver exceptional sound. It has a foldable design to makes it easy to pack for travel. Also, it has a built-in microphone to enable hands-free calls.