Monster 40 Watt Wireless Indoor/outdoor Speakers 40 Watt Wireless Indoor-Outdoor Speakers (20 watts each speaker) Bluetooth and NFC Connectivity for compatible devices Audible confirmation for easy connectivity 5.8 GHz wireless connectivity for robust sound quality Pair up to 8 speakers (additional purchase required of Monster BTW248XBK) 360 degree or Split for Stereo Sound Auxiliary (AUX) input for aditional audio source Volume control on individual speakers to balance out your listening experience Runs 5 hours, with a full charge, at max volume Wall Mountable 3.5mm audio cable included 100 feet range from main Bluetooth speaker Indoor / Outdoor weather resistance operation Not to be used submerged in water