<b>Features:</b> <p>1.Total silicone material with upgrade double-layer ear cap, make it comfortable for 24hours wear<br> 2.Effectively isolates noise, helping you to improve your sleep quality,enjoy your relaxation time<br> 3.Bluetooth 4.1technology,give you a prefect music experience</p> <b>Specification:</b> <p>Version:4.1<br> Chips:CSR8635<br> Battery Capacity:120mA<br> Quick charging:30-40minutes<br> Stand time:220 hours<br> Talk time:6 hours<br> Music time:6 hours<br> Sensitivity: 105+ 3db<br> Frequency: 20-20000Hz</p> <b>Warranty:</b> <p>We offer three months replacement and return warranty, if there is any question about the product, feel free to contact us, we would offer you the best solution asap.</p> <b>Method:</b> <p>1.Please keep the earphones and the phone or other device under 1 meter distance.<br> 2.Long press the multi-function 5-8 seconds until the led flash and listen the notice voice.<br> 3.Open the bluetooth function of your phone or other device and find the “MaxrockP103-4”name.<br> 4.Choose the “MaxrockP103-4”and connected,would listen the voice when finished the connection.</p> <b>Package include:</b> <p>1 * bluetooth headphones<br> 1 * user manual<br> 1 * USB charging cable</p>