... kinds of mobile phone accessories,for Iphone perimeter accessories,for iphone steering wheel speaker. 1,Output power:RMS 4W ... Frequency response: 80-18000Hz3,SNR:≥80dB4,Speaker:2*27mm speaker,magnetic resistant 4ohms5,Power supply:3.7V ... your phone to the steering wheel corresponding adapter and put your phone in the middle of the wheel,then ... with speakers. Steering wheel with speaker for Iphone 3G 4G