Bluetooth Headphone SH Free Cable Protector Multi functional design: support wireless connection via bluetooth, & wired connection with phones/computer.built-in battery: with high performance rechargeable polymer battery, this headphone provides 8-10 hours of music time, less than 3 hours of charging time.universally compatibility: suitable for most bluetooth-enabled devices, such as for iphone6s plus 5s 5 4s and android smartphones samsung galaxy phones and so on.