2X6.5IN RD TR WRLS SPKR2 x 6.5 in. high-efficiency woofersBuilt-in Bluetooth(R) allows speaker to work with Bluetooth(R) enabled devicesTrue Wireless Stereo (TWS) allows user to connect 2 like speakers via Bluetooth(R) to double audio output (second speaker sold separately)3.7-volt/1,800 mAh rechargeable batteryUSB/micro SD(TM) and auxiliary inputs to connect non-Bluetooth(R) external devicesFM radioFlashing light on woofer