Bluetooth Stereo Speaker Bar with a built-in mic is pre-amplified and magnetically shielded. Design also includes 2 watts per channel; two 1.6" full-range drivers; power and volume control; talk/pairing; play/pause, previous and next; LED and power indicators. Amplified by class DIC, speaker bar is powered by USB or battery (not included) and conforms to WEEE and RoHS directive.