For Auido Devices with No Build-in BluetoothThe Bluetooth receiver can realize the Bluetooth connection for the device (which does not have the Bluetooth function). In our daily life, such as some cars, wired earphones, home stereos, amplifiers, TVs and other devices without Bluetooth function, they can realize Bluetooth connection with mobile phones through this product. Let us fully enjoy the convenience and fun of wireless connection.Stable Bluetooth 5.0 TechEquipped with the most extensive Bluetooth 5.0 connection technology, making it connect rapidly and stably. Basically, it can be connected to various mobile devices (mobile phones, MP3, tablets, laptops). The effective connection distance can be up to 30 ft.Lossless Audio TransmissionA stable Bluetooth connection ensures that audio transmission will not be interrupted. DSP technology can effectively reduce echo and background noise, and play clear music or voice.Hands-free Call and Voice AssistantWhen the device is connected to a mobile phone, it can realize hands-free calls and voice assistants. When a call comes in, it will announce the caller's number. You can answer/reject/redial calls with one button. The microphone on the device can accurately receive and transmit voice signals within an effective distance of 2 meters, and can easily implement functions such as voice navigation.Up to 12-hour Play TimeIt can be used for up to 10 hours when fully charged. Using the type-c charging port, charging only takes 40 minutes. When connected to a mobile phone, the battery level of the product will be displayed on the mobile phone. The switch button design allows the device to be turned off and enabled at any time.