JBL M3 mini speaker features a 4.2V Bluetooth and 2.4G wireless music transmission system. A 4W high-powered amplifier system is used for outstanding sound quality. Built-in memory of 800mAh allows for continuous playback for up to 5 hours. Stereo systems, iPods, laptops, smartphones, and other devices are compatible without the need for a cable to be connected to a specific jack port.