Usage instructions: 1. Use three movable cards to select cards on the circuit board;
2. Adjust the width and strength of the upper and lower movable mouth;
3. When installing the circuit board, should first put one side of the circuit board into the card mouth with spring, push back and then do another circuit into the activity of the card block, it can work.
Notice:
1. The real color of the item may be slightly different from the pictures shown on the website caused by many factors such as brightness of your monitor and light brightness.
2. Please allow slight manual measurement deviation for the data. Thank for your understanding.