DHI-NVR4216-16P-4KS2/L - Dahua 16 Channel 1U 2HDDs 16PoE Network Video Recorder Brateck it has four different tones

it has four different tones - police

RBH FK640 Proximity Reader and Keypad may be mounted directly to standard single-gang US wall-boxes

Two keys for activating the auxiliary/porter call

1x) Network Security SPI Firewall

Designed to work with laptops

DHI-NVR4216-16P-4KS2/L - Dahua 16 Channel 1U 2HDDs 16PoE Network Video Recorder Brateck it has four different tones> New 4. 0 user interface, Security baseline 2. 1 > H. 264, H. 265, Smart H. 264+, and Smart H. 265+. H. 265 auto switch Max. decoding capability: 8 1080p@30 fps. Supports adaptive decoding > Supports mainstream cameras of ONVIF and RTSP protocols > P2P remote surveillance, video play on mobile device > VGA HDMI simultaneous video output, maximum resolution of HDMI is 4K > AI by Camera: Face detection, perimeter protection, IVS, people counting, heat