The Product which u see on Beside is iPhone 4s Battery Connector.
iPhone 4s Battery Connectoris a high quality and affordable repair part.
If your iPhone 4S having issues with on/off or battery disconnect you can replace it with below Product.
iPhone 4s Battery Connector is designed to work perfectly with your iPhone 4S.
The image below use to present product is just for reference
actual product will be different from image.