Uxcell Universal Switch Keypad DIY Keyboard 4 Keys 1 2 3 4 Down 1 pcs

What is this? Universal switch is an operating system integrating key functions indicating element and instrument panel. It is widely used in electronic communication electronic measuring instruments industrial control household appliances and DIY fields Is there any advantages of the product? The key display is clear easy to press and use. It is a good choice for DIY projects How to use it? Easy to install can be used with various circuit boards or other existing external input devices. What should I notice? The product has adhesive in back. Please tear off the paper to use.