... 1 speaker system with amplifier Frequency: 2.4-2.483GHz Shortest Latency: <0.5ms Frequency response: 20-20Khz 2.1 speaker system with amplifier1. ... stronger, output is 30W3. Black with red aluminium line, it is more fashionable.4. Volume part, according to your ... : yesVolumn Control: KnobLouderhailer: higher: 3 inch,4Ω,15W; Lower: 5 inch,4Ω, 30WLower controler: yesInterface: 2.4Gwiress receiver,4RCA ...