180W Mid Range Motorcycle Speakers with Aluminum Stereo Main Unit. High Performance Amplifier Built-in.Support Bluetooth Wireless connection up to 15 meter<br> 3.5mm Audio Jack AUX IN Available. Support USB and Micro--SD Card MP3 files. Support USB Charging. FM Radio. Clock Display.Perfect for Motorcycle ATV UTV Electric Bike Marine Boat<br> Bluetooth Wireless: Stream your favorite music and radio channel from your smartphone. Compatible with iPhone 4 / 5 / 6 / 7 / 8 / X, iPod, Samsung Android Galaxy S Note Series and any smartphone devices.<br> Superb Crystal Sound Quality. Advanced Waterproof Design(Speaker Only). Great for outdoor use.Easy Installation: Comes with all necessary hardware and wiring. Plug and Play. Standard 12V Power Connection.<br> Bluetooth Protocol: AVRVP1.0, GAVDP1.0, ADVTP1.0, A2DP1.0,Wireless transmission range more than the 15m,Frequency range:20Hz - 20KHz<br> 1) Bluetooth Wireless<br> 2) 3.5mm Audio Jack AUX IN<br> 3) USB 2.0<br> 4) Micro-SD Slot<br> 5) FM Radio<br> 6) Included Optional LED back-lit Wired Control<br> 7) Display with Clock<br> Specifications of the band FM:<br> Cover: 87 - 108 (+/- 0.55MHz)<br> Sensitivity: less than or equal to 11dB<br> Distortion: less than or equal to 0.5%<br> SNR: greater than or equal to 60dB<br> Rated Voltage: 12V DC<br> Rated Input Power: 4 x 25W<br> Max Input Power: 180W<br> Rated impedance: 4 - 8 ohm<br> Bluetooth Ver.: 3.0+EDR<br> 3.5mm Audio Jack: Yes<br> SD Slot Size: Micro--SD<br> USB: Support USB Drive in mp3 format<br> USB Charging: Yes<br> colour:Silver + black<br> Material:plastic<br> size:Host: 8.3*11.5*5cm<br> Horn diameter: 8cm<br> Speaker: 3.25 x 4 in<br> Wired Control: 1.5 x 2 in<br> Length: 10cm<br> Package Contents:<br> 4 x Speaker<br> 1 x Main Control Unit<br> 1 x Wired Control<br> 3 x Handlebar Clamp<br> 1 x Set of Installation accessories<br> 1x User Manual (Installation guide not included)<br> Important notes:<br> 1. Mounting clamp is