DBEST PS4001BT-RBR London Solo Bluetooth Rechargeable Mini-Speaker World's smallest Bluetooth Hi-Fi system Wireless music streaming up to 45 feet Engineered for exceptional clarity of sound Powerful built-in amplifier for a surprisingly loud volume Best-in-class battery performance for up to 20 hrs. continuous wireless or up to 40 hrs. wired playback Line input for audio sources without Bluetooth connectivity Compatible with phones, iPod, laptop, iPad and all devices featuring 2.1+EDR Bluetooth or 3.5mm audio jack Compatible with all standard USB chargers (PC, Car, wall charger) and includes deluxe travel pouch