How to - HP ProBook 6440b hard drive and Windows 10 upgrade - YouTube
HP ProBook 6440b specifications
HP PROBOOK 6440B LAPTOP, 4GB, 160GB HDD – refurbcatest
RU/US Keyboard for HP ProBook 6440B 6450B 6445B 6455B Series English Laptop keyboard (Without Point stick)|keyboard for hp|laptop keyboardlaptop keyboard for hp - AliExpress
Refurbished HP probook 6440b Core I3 laptop on SALE
Amazon.com: New Keyboard for HP Probook 6440b 6445b 6450b 6455b Series 584233-001 V103102BS1 US Black Without Point : Electronics