Features: Suitable for HP ProBook 6540B 6550B 6555B 609877-001 laptops. Great replacement for your faulty, worn out or broken keyboard. Tested before shipment and working. US layout, no track point, classical black color. If some keys do not work after installation, you can try to re-connect the ribbon cable to prevent poor connection. Specifications: Material: ABS+Metal Size: Standard Size Layout: US Layout Type: Without Point Language : English Applicable Models: for HP ProBook 6540B 6550B 6555B 609877-001 Laptops Package Includes: 1x Replacement Laptop Keyboard note: Please allow 0-1cm error due to manual measurement, make sure you do not mind before you order. Please allow slight chromatic aberration due to different display resolutions.