DBEST London Solo Rechargeable Mini Speaker - Rubberized Black (PS4011-RB) Ultra-portable and lightweight design Engineered for exceptional clarity of sound Powerful built-in amplifier for surprisingly loud volume Compatible with all devices featuring a 3.5mm audio jack High-capacity lithium polymer battery (400mAH) for up to 48 hours wireless playback Compatible with all standard USB chargers (PC, Car, Mains)