Features: Instruction: Button A: It controls the display of each line from MON to SUN. Each time you press the A button, jump one line from top to bottom. Button B: It controls the digits of each line. Each time you press button B, the small light bar will move one space from left to right. Button C: It controls the display of each digit from 0-9. Button D: It is the control switch. The setting sequence is from A to B to C, Press A first. The entire row of light bars flashes, Press B second, the light bar below a single number flashes, Press C third, to adjust to the number you want. After all settings are completed, the light bar stops flashing, and the settings are saved successfully. Specifications: Material: acrylic Color: red, black Size: approx. 23.6 x 16.7 x 0.8 inches Package includes: 1 x LED business open sign Notes: Manual measurement, please allow slight errors on size. The color may exist a slight difference due to different screen displays.