The Product which you can see Beside is iPhone 6S Sim Reader .
iPhone 6S Sim Reader is a high quality and affordable repair part.
If your iPhone 6S get an alert that says Invalid SIM or No SIM Card installed, When you notice that doesn’t make proper contact with the Sim Reader and its not working properly replace it with below Product.
iPhone 6S Sim Reader is designed to work perfectly.
The image below use to present product is just for reference
Actual product will be different from image.