Anonsuo Saturn Surround Sound Home Audio Round Speaker Portable Wireless Bluetooth Mini Speakers Black Latest Bluetooth V4.0 technology, Compatible with all Bluetooth-enabled devices,Outstanding connection range of up to 33 feet Fabric-Covered Speaker Grill, Built in lithium battery lasts up to 6 hours, Built-in Mic for Hands-free Calls Connect any non-Bluetooth device via 3.5mm port, it could automatically play the music with a stand-alone Micro SD card Built with two 2inch high-performance neodymium speakers and an imported diaphragm, this device plays music well Speaker Dimensions: 3.5 x 3.5 x 3.5 inches (LxWxH)