General description Experience high-quality audio on the go with the 3 Inch Motorcycle Waterproof Bluetooth Speakers and 4 Channel Amplifier. This powerful audio system features a built-in high-performance amplifier and supports Bluetooth wireless connections up to 15 meters, allowing you to stream your favorite music and radio channels directly from your smartphone. Designed for motorcycles, ATVs, UTVs, electric bikes, and marine boats, this system delivers superb crystal sound quality and is perfect for outdoor use. Technical specifications Rated Voltage: 12V DC Rated Input Power: 4 x 25W Max Input Power: 180W Rated Impedance: 4 - 8 ohm Bluetooth Version: 3.0+ Bluetooth Protocols: AVRVP1.0, GAVDP1.0, ADVTP1.0, A2DP1.0 Wireless Transmission Range: More than 15m Frequency Range: 20Hz - 20KHz FM Radio Frequency Range: 87 - 108 (+/- 0.55MHz) FM Sensitivity: ≤ 11dB FM Distortion: ≤ 0.5% FM SNR: ≥ 60dB Speaker Size: 3.25 x 4 in Main Control Unit Size: 8.3 x 11.5 x 5 cm Wired Control Size: