HP ProBook 4540s Core i5 (USED) with gst bill

HP ProBook 4540s (B8Z31PA) Laptop (Core i5 3rd Gen/4 GB/500 GB     HP ProBook 4540s (B8Z31PA) Laptop (Core i5 3rd Gen/4 GB/500 GB/DOS) Specifications General Information   Brand   HP Model   4540s (B8Z31PA) Dimensions(WxHxD)   375 x 256 x 28  mm Weight   2.3 Kg Colors   Anodized Aluminum Operating System   DOS Operating System Type   64-bit Display Details   Display Size   15.6 Inches (39.62 cm) Display Resolution   1366 x 768 Pixels Display Type   LED Display Features   High-Definition LED Anti-Glare Display Display Touchscreen     No Performance   Processor   Intel Core i5-3210M (3rd Gen) Clock-speed   2.5 Ghz Chipset   Intel B75 Express Graphic Processor   Intel HD 4000 Memory   Capacity   4 GB RAM type   DDR3 RAM speed   1600 Mhz Memory Slots   2 DIMM Expandable Memory   16 GB Storage   HDD Capacity   500 GB HDD Speed(RPM)   5400 RPM HDD type   SATA Battery   Battery Cell   6 Cell Battery type   Li-Ion Power Supply   65 W Battery Life   7 Hrs Networking   Wireless LAN   802.11 b/g/n Bluetooth   Ports   USB 3.0 slots   2 USB 2.0 slots   2 SD Card Reader   Headphone Jack   Microphone Jack   VGA Port   Multimedia   Web-cam   Secondary cam(Rear-facing)     No Audio Solution   HD Audio Solution Speakers   Stereo speakers Sound Technologies   SRS Premium Sound PRO In-built Microphone   Microphone Type   Digital Microphone Peripherals   Optical Drive   LightScribe SuperMulti Drive with Dual Layer Support Pointing Device   Touchpad Keyboard   Standard Keyboard with Numeric Keypad