It adopts a closed full touch screen and has dustproof and waterproof touch buttons, which are as easy to operate as a mobile phone.<br> It uses Bluetooth playback, U disk playback, a set of AUX inputs, a set of RcA outputs, and a set of SUB subwoofer outputs to achieve lossless song playback and more detailed and clear transmission to achieve a truly humanized design experience.<br> High-definition Bluetooth 5.0 version for call music playback, built-in BT5.0 Bluetooth module for automatic interconnection, high-speed and low-energy technology, mobile phone Bluetooth for interconnection, support for mobile APP navigation broadcast, song playback, answering calls, and caller ID.HD hands-free calling with built-in HD noise reduction microphone, clear voice quality<br> Bluetooth signals have an effective transmission distance of 10 meters and are stable and free from interference. Compatible with for IOS, Android, and Windows system devices, enjoy system networking, and compatible with APP playback<br> The digital anti-interference radio IC module is used to truly amplify the signal, and radio stations can be searched in remote mountainous areas. Automatic channel search and manual fine-tuning mode automatically store FM channels.<br> Voltage: 12V<br> Power requirements: DC9V-12V<br> Available sensitivity: 15dB<br> Load impedance: 4x4Q<br> Signal to noise ratio: 50db<br> Stereo separation: 30dB (1KHz)<br> IF range: 10.7 MHZ<br> Maximum output level: 1.5vrms (3dB)<br> Frequency response: 20Hz-20KHz<br> Signal to noise ratio: 60dB<br> Separation: 50db<br> Radio band: FM875-108MHZ AM522-1620KHz<br> Suitable for yachts, engineering vehicles, backhoes, forklifts, trucks, , , etc.<br> Compatible formats: MP5 Mp4 MKV MP3/WMA, BT, USB, SD, FM<br> Tips: The product may be updated constantly, Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use<br> Material: ABS<br> colour: Black<br> Package Contents:<br> 1 x MP5 marine speakers in boat<br> Only the above package content, other products are not included.<br> 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.