The high-quality Wireless Bluetooth Headphones feature two pieces that can be used separately for two devices or as a classic headset. The headphones have good sound, stable performance, noise reduction and a built-in microphone that supports handsfree calls. The built-in battery guarantees a long standby time and the case is used to charge and transfer the headphones.Bluetooth: 5.0Charging time: 1.5hintegrated Li-Ion battery 30mAhBattery capacity in case: 300mAhCharging connector in case - microUSBHeadphone charger connector - 2mmPlayback time: 3h