Why are ATMs using metal numeric keypads?

Making transactions at the ATM is quite familiar to many people but there is certainly an interesting detail that most people don't pay attention to. It is the ATMs of most banks that use metal numeric keypad rather than other keyboard types.

• How to prevent it from being stolen from your bank card
• When we have an electric gun, we often faint, why?
• Why do people often choose white to paint airplanes rather than other colors?

The cause of using metal numeric keypads is to prevent code leaks. Because if you use other keyboards, after you press your password, the temperature of the keyboard will be changed. If immediately after the transaction was successful, someone used a heat-sensing camera to capture the keyboard, you might lose your password.

Looking at the picture below you will see it clearly.

In the picture, the number 5 with the most red color indicates that it is the last character pressed. Through observing the depth of color, you can easily guess the order of the password string is 12345.

But with the metal keyboard, it is highly conductive, the temperature changes are relatively fast, so if someone uses a thermal sensor camera to capture immediately after you have successfully traded, it is difficult to observe. color to guess your password.