This article provides what is the VESA mounting pattern on the back of the 1502L monitor

For the 1502L touchmonitor, a four-hole 75x75mm and 100x100mm mounting pattern for M4 screws is provided on the rear of the monitor. Remove the stand using a Phillips screwdriver to access this mounting interface. The VESA FDMI-compliant counting is coded: VESA MIS-B, 75, C and VESA MIS-B, 100, C.