ARTDIO 2.0 PORTABLE BLUETOOTH SYSTEM BLK TOOTH SYSTEM BLK4-watt total RMS2 x 1 1/2" full-range driversBuilt-in microphone for wireless speaker phone capability Pre-amplified and magnetically shieldedCompliant with Bluetooth® v1.2 devices up to 33'Uses AC adapter or 4 AAA batteries (included)Includes 3.5mm stereo input cable, AC adapter and carrying case