A.3.5" classic bullet shell, strong construction, compact and high quality B.3" enhanced full-range speaker core, outstanding sound performance C.Built-in Bluetooth, popular way to connect to music. D.Built-in 300W D-class amplifier, continuous boost support. E.On-key Power on/off wired remote, very easy to operate while driving. F.SAE quick disconnect power cable, easy to hook up to the battery of vehicles. G.Input Voltage: DC 10-16 V Input Sensitivity: 100MV-3000MV H.Rated Power: 2*20W @ 4Ω I.Peak Power: 300W J.Channel: 2.0 K.Response Frequency: 20Hz-20KHz L.S/N: >80dB M.Built-in Bluetooth N.Wired remote one-key power on/off