The Bem Outlet Speaker can connect directly to an electrical outlet (110 V). From there, you can connect to the speaker from your iPhone or any Bluetooth device. You can tuck the speaker behind a sofa, near a desk, or under a kitchen cabinet so that it ail not take up much space. The Bem Outlet Speaker is only slightly bigger than a juice box and lets you avoid messy speaker wires. Devices must be within 25 feet to connect to the speaker. The Bem Outlet Speaker also has a USB port or 3.5mm jack to play your MP3s.