It adopts a closed full touch screen and has dustproof and waterproof touch buttons, which are as easy to operate as a mobile phone. It uses Bluetooth playback, U disk playback, a set of AUX inputs, a set of 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. 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 Bluetooth signals have an effective transmission distance of 10 meters and are stable and free from interference. Compatible with for IOS, Android, and system devices, enjoy system networking, and compatible with APP playback 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. Voltage: 12V Power requirements: DC9V-12V Available sensitivity: 15dB Load impedance: 4x4Q Signal to noise ratio: 50db Stereo separation: 30dB (1KHz) IF range: 10.7 MHZ Frequency response: 20Hz-20KHz Radio band: FM875-108MHZ AM522-1620KHz Suitable for yachts, engineering vehicles, backhoes, forklifts, trucks, , , etc. Compatible formats: MP5 Mp4 MKV MP3/WMA, BT, USB, SD, FM Colour:White Material:plastic Due to different product batches, the appearance , which does not affect the use Package Contents: 1 x MP5 marine speakers in boat Only the above package content, other products are not included. 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.