How many colors do these monitors display?

The monitors display 16.7 million colors.

What is the refresh rate of these monitors?

The refresh rate of these monitors is 60 Hz.

No, there are no built-in speakers or a webcam.

Yes, the monitors are VESA compatible and can be mounted on the wall.

The size of these monitors is 24 inches.

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ViewSonic VG2448A-2_H2 24 Inch Dual Pack Head-Only 1080p IPS Monitor with Ultra-Thin Bezels, HDMI, DisplayPort, USB, and VGA for Home and Office

Dual Pack Head-Only
The VG2448a_H2 supports laptops, PCs, Macs and more with HDMI, USB, DisplayPort and VGA inputs
Optimized view settings offers "Game" "Movie," "Web" "Text" and "Mono" presets
Sold as a dual pack without monitor stands for easy dual-screen installation
Flicker-Free technology and a Blue Light Filter for reduced eye fatigue
Eco-friendly easy-open box for streamlined monitor setup
24 Inch Full HD (1920x1080p) IPS monitors with 60Hz refresh rate