Otis wireless speaker metal and fabric weave finish wireless speaker. You can do hands-free phone calls thanks to the built-in microphone. Audio content is played from a Micro SD card slot. Controls for Play/Pause, Next/Previous Track, and Volume. Battery is UL certified and has a capacity of 400mAH. Wireless technology with a minimum range of 10 meters/33 feet. Battery is FCC, CE, RoHS, and UL listed.