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General InformationHP ProBook 4540s (B8Z31PA) 
Dimensions(WxHxD)375 x 256 x 28  mm
Weight2.3 Kg
ColorsAnodized Aluminum
Operating SystemDOS
Operating System Type64-bit
DisplayHP ProBook 4540s (B8Z31PA)
Display Size15.6 Inches (39.62 cm)
Display Resolution1366 x 768 Pixels
Display TypeLED
Display FeaturesHigh-Definition LED Anti-Glare Display
Display TouchscreenNo
HardwareHP ProBook 4540s (B8Z31PA)
CPUIntel Core i5-3210M (3rd Gen)
CPU Speed2.5 Ghz
ChipsetIntel B75 Express
Graphic ProcessorIntel HD 4000
MemoryHP ProBook 4540s (B8Z31PA)
Capacity4 GB
RAM typeDDR3
RAM speed1600 Mhz
Memory Slots2 DIMM
Expandable Memory16 GB
StorageHP ProBook 4540s (B8Z31PA)
HDD Capacity500 GB
HDD Speed(RPM)5400 RPM
HDD typeSATA
BatteryHP ProBook 4540s (B8Z31PA)
Battery Cell6 Cell
Battery typeLi-Ion
Power Supply65 W
Battery Life7 Hrs
Network & ConnectivityHP ProBook 4540s (B8Z31PA)
Wireless LAN802.11 b/g/n
BluetoothYes
PortsHP ProBook 4540s (B8Z31PA)
USB 3.0 slots2
USB 2.0 slots2
HDMIYes
SD Card ReaderYes
Headphone JackYes
Microphone JackYes
VGAYes
MediaHP ProBook 4540s (B8Z31PA)
Web-camYes
Audio SolutionHD Audio Solution
SpeakersStereo speakers
Sound TechnologiesSRS Premium Sound PRO
In-built MicrophoneYes
Microphone TypeDigital Microphone
PeripheralsHP ProBook 4540s (B8Z31PA)
Optical DriveLightScribe SuperMulti Drive with Dual Layer Support
Pointing DeviceTouchpad
KeyboardStandard Keyboard with Numeric Keypad