The PR-D4BT is a portable AM / FM radio from SANGEAN that put out the best reception. With less noise and interference, you get to enjoy clear reception no matter where you are. AM Auto Tracking will automatically optimize the sensitivity of the station you're tuned to and pull in the distant stations. You can now also enjoy your own favorite tunes off your phones or tabs via Bluetooth streaming. The PR-D4BT has the battery level indicator and comes with an AC adapter so you will never need to worry about running low on power no more!