Compatibility This HD-TVI security camera is only compatible with HD-TVI analog DVR systems. For audio recording, ensure your DVR supports audio input. However, it works perfectly with ZOSI's new DVR recorder. 2MP HD Bullet Camera with AudioThe camera has a built-in microphone, no speaker, and supports one-way audio only. You can hear the other party speaking, but can't have a two-way conversation. 1080P high resolution provides clear images day and night.