Renewed products look and work like new. These pre-owned products have been inspected and tested by Amazon-qualified suppliers, which typically perform a full diagnostic test, replacement of any defective parts, and a thorough cleaning process. Packaging and accessories may be generic. All products on Amazon Renewed come with a minimum 90-day supplier-backed warranty. Laser technology delivers 20 times the performance of standard optical tracking Miniature sensors detect even the slightest movement Top-shell design matches other Apple products Bluetooth technology and Touch-sensitive technology