Wireless Bluetooth hands-free motorcycle audio kit(Main unit+4 X Speaker) High fidelity stereo design, Large LCD display with function clock Allow you to listen MP3 music from Bluetooth device or FM radio without cable connection Bluetooth synchronous broadcasting,you will not miss the retransmission sport event,a special flash information of when your are on the road Support MP3 music from USB or SD/TF card(not Support 3.5mm external connection of MP3 players or iPod etc, not being a sound box) Support full-band FM channel(AM band is not available) Built-in high-sensitive MIC to support hand-free call Has warning bell when the phone rings,voice prompt when change modes remote control has a built in AUX input and background light for dark conditions 2 X Pair of 3" 2-Way UTV/ATV/BOAT Mountable Speakers, these speakers can be mount on any roll bar with size of 20cm-25cm (mounting pads are included) Speakers cable length is 250cm allow you put the speaker on any place you want. Power Amplifier Specification Power: 4x25W Speaker impedance 4-8Ω Black ABS shell5 Rated Voltage: DC 12V Speaker Size(DxH):83.5mm(3-1/8")*102mm(4") Main Unit Specification: Input Voltage: DC 12V (36V-72V Model need an adaptor) Bluetooth V3.0+EDR, support AVRCP1.0,GAVDP1.0,AVDTP1.0,A2DP1.0 Frequency Response: 21402GHz-2.480GHz Practical Sensitivity: 60dB Effective Transmission Distance: >10M FM Frequency Range: 87-108MHz Main Unit Size: approx 100mm(4")*60mm(2-3/8")*44mm(1-3/4") Package Included: 1x main unit, 4x speakers, 1x mounting bracket for main unit