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Basic SpecsHP ProBook 4520s (WS857ES) 
Typenotebook
Operating SystemWin 7 Professional
ProcessorHP ProBook 4520s (WS857ES)
ProcessorCore i3 2130 MHz
Processor Model330M
Number of Cores2
L3 Cache3 MB
Chipset ModelIntel HM57
MemoryHP ProBook 4520s (WS857ES)
Memory2048MB DDR3
Maximum Memory8192 MB
Number of Total Memory Slots2
DisplayHP ProBook 4520s (WS857ES)
Display15.6-inch, 1366x768, widescreen
Backlight TechnologyLED
Graphics Controllerbuilt-in
Graphics Chipset ModelATI Mobility Radeon HD 4350
Graphics Memory512 MB GDDR3
Storage DevicesHP ProBook 4520s (WS857ES)
Optical Drive TypeDVD-RW, removable
Storage Size250 GB Serial ATA
Hard Drive Speed7200 r/min
CommunicationHP ProBook 4520s (WS857ES)
LAN/ModemNIC 1000 Mbit/s, a fax modem
Wireless Communicationbluetooth, Wi-Fi 802.11n
InterfacesUSB 2.0x4, VGA (D-Sub), HDMI, microphone input, audio output/headphone, eSATA, LAN (RJ-45) and modem (RJ-11)
Expansion slotsHP ProBook 4520s (WS857ES)
ExpressCard slotExpressCard/34
Memory Card ReaderYes
Memory Card SupportMS, MS PRO, SD, xD-Picture Card
BatteryHP ProBook 4520s (WS857ES)
Maximum Battery Run Time3 hours
Battery Capacity4700 mAh
Number of Battery Cells6
Battery ChemistryLi-Ion
Input DevicesHP ProBook 4520s (WS857ES)
Pointing Device TypeTouchpad
AudioHP ProBook 4520s (WS857ES)
SpeakersYes
MicrophoneYes
Detailed SpecsHP ProBook 4520s (WS857ES)
WebcamYes
Featuresmetal case lock slot
Dimensions (HxWxT)371.8x249.6x27.7 mm
Weight2.39 kg