Behold the GGMM M4 Indoor and Outdoor Speaker [$200]. It has two modes: direct connection and router mode. Router mode allows up to 16 users to stream through home Wi-Fi network. the high-capacity polymer lithium battery provides 6-8 hours of continuous use. It also has wireless active speakers with Digital Signal Processing and MAX BASS button. The free GGMM App allows you to connect and access stored music or stream from online sources. It is compatible with iOS / Android / Mac OS / Windows.