Monster BTW249 40W High Performance Indoor/Outdoor Bluetooth Speakers, Expandable up to 8 Speakers, Water Resistant, and Wall Mountable (Two Speakers Included) Features a total of 40 watts of explosive power to give you the best audio performance. Wireless connection is available via EZ- Play, Bluetooth, and NFC technologies. EZ-Play technology gives you the ease to stream your favorite audio to multiple speakers (up to 8 speakers). Unique design creates the ultimate audio environment by filling any room or backyard with an even amount of crisp sound. Water/moisture resistant speaker gives you the freedom of listening in all types of environments.