Features: Ergonomical design for painless wear, easy to wear for a whole day not feeling load. Advanced chip with built-in high-resolution decoder, high transmission efficiency and long barrier-free more→transmission distance. 170 mAh polymer battery to supply power, low power consumption, ultra long standby time, suitable for multiple purposes. Unique HIFI original sound quality HD vocals, low, medium, high triple frequency equilibrium. 180¡ã rotating earpiece, allows left ear or right ear to wear freely. Support for IOS system and a small number of for Android systems, support real-time display of power. Specification: Condition: Brand New Model: F900 Material: ABS Main Color: Black Bluetooth Ve…