Universal articulating mounting clamps fit virtually any bars between 7/8" and 1-1/2", brackets are patent pending; Watch install video for in depth installation instructions Internal 4-channel amp powers two 2" x 3" full-range speakers with dual voice coils; Four high-frequency 1" silk dome tweeters with N42 grade magnets for powerful distortion-free sound at any volume level 4.1 Bluetooth receiver allows wireless connectivity to any Bluetooth-enabled smartphone or music device; Auxiliary input and output ports connect standard devices via 3.5 mm cable Durable IP66-rated housing is weather-resistant; Built-in heat sink and self-protection circuit combat excessive heat and over/under voltage regulation Motorcycle handlebar mounted sound bar with 300 watt peak power and 1.0 Amp USB charging port; Speaker measures 10.6" L x 2.9" diameter, bracket measures 6" L x 3" in diameter; Mounted speaker stands approximately 5.25” from center of handlebar