Monster 40 Watt Wireless Indoor/Outdoor Amplified Bluetooth Speakers (Separates to make a Pair) BTW248 Rechargeable with Li-ion Batteries - White 40 Watt Wireless Indoor-Outdoor Speakers (20 watts each speaker) 360 degree or Split for Stereo Sound Easy Bluetooth Connectivity 5.8 GHz wireless connectivity for robust sound quality With 5.8 GHz you can expand by pairing up to 8 speakers (additional purchase required of Monster BTW248) Auxiliary (AUX) input for additional audio source Volume level is controlled by Bluetooth device 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