Speakers: It includes two high power 3-Inch full-range speakers, which can provide high-quality sound, and has FM radio. Bluetooth: Play and control a library of your favorite music using your smartphone or MP3 device,and connect to various multimedia apps via Bluetooth. Easy to install: just match the size and you can plug and play. Mounting hole size: 7/8-1.25 inch. (Suitable for installing on motorcycle handlebar) Built-in power amplifier: There is no need to connect and install a power amplifier, all amplifier equipment is built into the audio system, simplifying the application of audio. Appearance and control: The all-metal shell is polished and chrome-plated, and it is waterproof design, the outdoor experience is very good; Simple knob function, very easy to control.