Advertisement says the monitor is 12 inch and the overview says 15 inch. Which is it? Also, is it vesa mountable?

The monitor is 12 inches. Regarding whether it is VESA mountable, that information is not provided in the product details.

Questions & Answers: 12-Inch Capacitive Multi-Touch POS TFT LED Touchscreen Monitor, True Flat Seamless Design with Adjustable POS Stand for Retail Restaurant, HDMI & VGA Inputs, High Resolution 1024 x 768

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12-Inch Capacitive Multi-Touch POS TFT LED Touchscreen Monitor, True Flat Seamless Design with Adjustable POS Stand for Retail Restaurant, HDMI & VGA Inputs, High Resolution 1024 x 768

High Native Resolution 1024 x 768! NO DRIVER REQUIRED, Plug & Play Capacitive Touch screen monitor supports multi-touch operation under Windows 8/10, single touch in Windows 7/XP/2000
Capacitive Multi-Touch screen can register up to 10 simultaneous touch points, this monitor is extremely fast and accurate for POS or office use
Multi-Touch Operation like Drag-n-Dropping can instantly increase your touch operation productivity
True Flat (no bezel) Seamless Design, the touch screen can easily be wiped clean & eliminating the dust and dirt
Metal Stand can be easily tilted from 0° to 90° - quickly moving the user from passive viewing to full touch screen interaction

$179^.99 –