Audiosharp AS0847 Music Eyes Portable Wireless Bluetooth 4.0 Speakers (Red) Support Wireless Music Streaming with Bluetooth v4.0 + EDR Technology Perform incredible sound quality by dual driver units speakers. Built-in 650 mA Rechargeable Battery for up to 5 hours of music play time, 300 hours standby time. Equipped with a built-in microphone for hands free calling.It supports voice prompt in English.(The default language of voice prompt is English, if the product that you received is in other language, please turn on the device, then hold multi-function key for seconds, until beep, the voice prompt language will be switched.) Connection range of up to 30 feet free space, also supports connect to devices through 3.5mm AUX Cable (Aux Cable is included in package)