180W Mid Range Motorcycle Speakers with Aluminum Stereo Main Unit. High Performance Amplifier Built-in.Support Bluetooth Wireless connection up to 15 meter 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 Bluetooth Wireless: Stream your favorite music and radio channel from your smartphone. Compatible with / 5 / 6 / 7 / 8 / X, , Android Galaxy S Note Series and any smartphone devices. 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. Bluetooth Protocol: AVRVP1.0, GAVDP1.0, ADVTP1.0, A2DP1.0,Wireless transmission range more than the 15m,Frequency range:20Hz - 20KHz 1) Bluetooth Wireless 2) 3.5mm Audio Jack AUX IN 3) USB 2.0 4) Micro-SD Slot 5) FM Radio 6) Included Optional LED back-lit Wired Control 7) Display with Clock Specifications of the band FM: Cover: 87 - 108 (+/- 0.55MHz) Sensitivity: less than or equal to 11dB Distortion: less than or equal to 0.5% SNR: or equal to 60dB Rated Voltage: 12V DC Rated Input Power: 4 x 25W Max Input Power: 180W Rated impedance: 4 - 8 ohm Bluetooth Ver.: 3.0+ 3.5mm Audio Jack: Yes SD Slot Size: Micro--SD USB: Support USB Drive in mp3 format USB Charging: Yes colour:Silver + black Material:plastic size:Host: 8.3*11.5*5cm Horn diameter: 8cm Speaker: 3.25 x 4 in Wired Control: 1.5 x 2 in Length: 10cm Package Contents: 4 x Speaker 1 x Main Control Unit 1 x Wired Control 3 x Handlebar Clamp 1 x Set of Installation accessories 1x User Manual (Installation guide not included) Important notes: 1. Mounting clamp is designed for 7/8 inch to 1 inch bar only. Custom mounting required for bar larger than 1 inch. Please check measurement before purchase. 2. Only the speakers are waterproof. The amplifier is NOT waterproof. Please install the amp in a shaded area to avoid and direct sunlight. The power amplifier is normal to get warm while in use. Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.