AC power supply, CAR power supply, and own battery power supply three ways automatic switching, program-controlled battery management, program-controlled multi-segment MP3 playback and recording, DSP audio processing, Horn beam angle can programable adjustment, up to 150dB sound pressure delivery output, support LINE-MIC input and MP3 recording control on the remoter, support main MIC input and MP3 recording control , and successfully pass military-grade functional experiments and environmental tests.