Power supply with overvoltage protection, reverse line protection, short circuit protection. With automatic power-off protection, voltage instability occurs when the input voltage exceeds 16V, the audio is automatically turned off to protect the circuit. A new style superior four level dust-proof and waterproof Speakers specially designed suitable for motorcycle. Support suitable for USB/TF Card/AUX playback also support MP3 and WMA music suitable format play. Bluetooth connection phone to , electronic tuning FM radio, tri-band 18 stations are stored, enjoy your music on the road and relax. Support USB/TF card/AUX interface.Support MP3/WMA music suitable format whole machine striple design and double horn hollow out design. Non-slip, feel good, exquisite beauty. Multi-angle adjustable stand, suitable suitable for all kinds of handlebar. Stent using hexagonal bolts, quick and easy installation. Universal fits suitable for most 20~22.5mm mounting bracket motorcycle,motorbikes Voltage: 12 v Speaker power: 2 * 7W. Waterproof: Ip4 colour:Silver&Black Material:stainless steel size:26*8*7.5cm Package Contents: 1 * motorcycle modified audio Only the above package content, other products are not included. Note: Light 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.