Amazon.com: Rocksteady Stadium Portable Bluetooth 4 Speaker and Subwoofer Combo - Includes 4 Speakers + 1 Subwoofer - Up to 100 Foot Range - Up to 16 Hour Battery Life : Electronics
Amazon.com: Tmvel Masti Pro Wireless Bluetooth 4.0 16 Watts Ultra Bass Subwoofer Sound Effect, True Wireless Stereo Speaker, DSP Technology - Built In Mic For Calls - Up to 14 Hour Playtime - Gold : Electronics