Bluetooth 4.1 Wireless Speaker, natural sound, portable, hand free call, work for iPhone iPad Android or Desktop Devices with MP3 Player and Microphone (blue) Powerful amplifier delivers natural sound. Built-in rechargeable lithium polymer battery supports up to 7 hours of playtime. The speaker looks like a trunk, and a tiny body allows you to carry it wherever you go. Wireless speaker comes with Bluetooth 4.1 that is compatible with most Bluetooth-enabled devices within 30 feet. Built-in microphone/voice prompts for hands free call. Connect non-Bluetooth media devices via 3.5 mm Aux cable.