https://www.overseadia.com/en-US/detail/dacb14ba2ac63e466ade485c517a267a DAR-5001A Port Standalone Voice Logger Exporter - Yishi model 6 is an advanced voice logging system that records audio in the WAV format. With features like crime prevention and anti-harassment, voice and call announcement, answering machine and voice mail, time and date stamp, loop recording, and external speaker and headphone jack, this system is perfect for ensuring communication security. The real-time clock adds to the convenience, while the system is compatible with applications like PSTN, landline, FCT, FWP, intercom, radio, and microphone voice. The system supports memory up to 128GB SD card.