Does this record 30 fps?

This NVR Frame Rate is 4CH@25fps (PAL), 4CH@30fps(NTSC）

How is the nightvision on these compared to the 5mp ones?

Hi,they have same nightvision distance about 65ft-100ft.

Will onvif ever become available for the 4k cameras in this package?

Dear, the 4K camera B800 doesn't support ONVIF.

Do the cameras have to be connected directly to the nvr, or can 3 cameras be connected to a switch and then run one cable back to the nvr?

Right, although MAKE sure those switch(s) are POE. If you buy a cheap switch that does not support POE, you'll have to power the camera via barrel male power connector (12v 2amps) so that's 24w per camera (if I'm not mistaken, could be over 1amp making it 12W) volts x amps = watts (MhA to mA 1000 = 1mA)

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Description

🛡️ See everything, miss nothing — security that works as hard as you do.

ALWAYS ON SECURITY - Reliable 24/7 recording with a spacious 2TB HDD, expandable up to 16TB.
SMART DETECTION ALERTS - Get notified only for people, vehicles, or pets—no more false alarms.
CRYSTAL CLEAR 4 K ULTRA HD - Experience razor-sharp 8MP video with vivid detail, even when zoomed in.
FUTURE PROOF EXPANDABILITY - Supports up to 12 channels and integrates with Reolink’s latest Wi-Fi and PoE cameras.
EFFORTLESS PO E INSTALLATION - One cable powers and connects your system—perfect for quick DIY setup.

The REOLINK 4K Security Camera System delivers ultra-high-definition 8MP video with advanced person, vehicle, and animal detection. Featuring a plug-and-play PoE setup, it offers continuous 24/7 recording on a pre-installed 2TB HDD, expandable up to 16TB. Compatible with up to 12 channels and multiple Reolink camera models, this system ensures comprehensive, smart home or office surveillance with remote access via iOS and Android apps.

Specifications

Focal Length Description	fixed, wide-angle
Night Vision Range	100 Feet
Frame Rate	20fps
Recording Mode	Motion Recording; schedule recording; 24/7 recording
Lens	Fixed
Viewing Angle	87 Degrees
Optical Sensor Technology	CMOS
Total Usb Ports	2
Hardware Interface	VGA, USB, eSATA, Ethernet, HDMI
Power Source	DC
Operating System	iOS, Android, Windows, Mac OS
Compatible Devices	Smartphones, Personal Computers, Tablets, Laptops, Cameras
Signal Format	Digital
Camera Description	Rear, Front
Night Vision	Night Vision
Connectivity Technology	Wired
Video Capture Resolution	4K 8MP (2560 × 1920)
Additional Features	Easy to Install, Waterproof, Vehicle Detection, Adjustable, Motion Sensor
Number of Channels	8
Memory Storage Capacity	2 TB
Item Dimensions	14.76 x 7.68 x 11.42 inches
Color	White