... 5mm Aux in, USB powered,Class D amplifier, 50% higher power efficiency,Max 2W / Ch,Volume control,LED power indicator It is easy to ... use of the high efficiency of class D amplifiers to present excellent sound quality.Specification:Power output: RMS 1W*2Driver: 1. ... sound. The speakers make use of the high efficiency of class D amplifiers to present excellent sound quality. Specifications Drivers: 1 ...