Both ears are turned on at the same time, automatically paired, and bilateral HD calls. A new generation of Bluetooth 5.0 technology, with faster transmission speed, no call delay and more stable signal. High sensitive microphone, no matter how noisy the environment is, you can talk easily. 200mAh charging compartment capacity. You can link one device at the same time or connect two devices separately. Ultra-portable charging compartment, easy storage, more freedom to go out. The standby time is up to 50 hours, and the barrier-free transmission distance is 10 meters.