? Bluetooth: Allows you to play music from your media devices wirelessly? Built-in rechargeable battery: Allows for longer play time (no batteries needed)? Built-in amplifier: Provides stronger clear quality sound? Operating Distance: 10 meters? 3.5mm Auxiliary Jack? Power Output: 2.2W? SNR: -95 ± 2dB? Speaker: D40mm (20Hz - 20KHz)