NOTE: This adapter doesn't have built-in battery, power by AC to DC power adapter or USB cable. This product is a bluetooth receiver ONLY, not a bluetooth transmitter. Only to give Bluetooth capabilities to an existing stereo / powered speaker / PA.Wireless range: Indoors(without obstacles) connect rang up 30-40 ft (10-12 m).Works with most device: Bluetooth enabled device including smartphones, tablets, computers, laptops upon and any powered PC speakers, home stereo systems and A/V receivers.Easy setup and automatic reconnect: There is a big bluetooth symbol button in bluetooth receiver middle. Pair your bluetooth device to this adapter with a single button press. Click once means Start/Pause. Hold the botton 3 second mean ON/OFF. It can reconnect automatically with the previously paired device.Listen music wireless: Connect with computer speakers, home stereo systems or other speaker systems via the 3.5 mm or RCA cable, then pair with the Bluetooth audio devices such as smartphones or tablet for streaming music.