Connect wirelessly or with AUX Cable in your phone or a TF card to enjoy your favorite Music with XECH A4 on-ear Headphone. It uses latest Bluetooth 4.0 + EDR which works much better. This means no interference with mobile 4G signals. Bluetooth 4.0 also conserves battery power much better for longer playtime. It is compatible with mobile phones/ laptops and all device which supports Bluetooth 4.0.A built-in rechargeable battery provides 10+ hours of listening, while ear pad mounted controls and built-in mic give you complete control on music and phone calls.