Enjoy your music virtually anywhere with the GGMM M4 WiFi Wireless Bluetooth Speakers. They come with a built-in rechargeable battery. There is a durable microfiber wrapped around the entire speaker that includes a stylish leather belt you can use over the shoulder or as a hand-carry. Along with this, the CSR Bluetooth 4.0 & Realtec Wi-Fi transfer mode allows you to combine multiple M4s together. The speaker entertains two modes: direct connection and router mode. Router mode allows up to 16 users to stream through home Wi-Fi network.