Homesources Bluetooth Hand-Free In-car Speakerphone Support Bluetooth 4.0 3.0 2.0 Talk time: up to 10 hours. Charging Time Clear timbre Great Sound volume and easy to install and Setup multi-language voice prompt (English Chinese Spanish) If you have a accent in these three language the device it hard to understand your command. When the system pont out low power please charge it, otherwise the calling result static voice and difficult connect