IBM ThinkPad X31 is an ultra-portable notebook for the global mobile user. At approximately 1-inch thin and 3.6 pounds, it boasts the longest system battery life in the industry. The ThinkPad X31's unique battery options also work with the system battery to deliver all-day computing for people who take their notebooks with them anywhere and everywhere. The X31 can work with the optional X3 UltraBase with an ergonomic design and an array of drive and battery expansion options for global travelers.

Specifications

Key Features
Processor  Pentium M 1.4 GHz 
Installed Memory  256 MB (DDR SDRAM) 
Hard Drive  40 GB IDE 
Display  12.1 in. TFT Active Matrix 
Operating System  Microsoft Windows XP Professional 

Processor
Processor Type  Pentium M 
Processor Manufacturer  Intel 
Processor Speed  1.4 GHz 

Motherboard
Bus Speed  400 MHz 

Memory
Installed RAM  256 MB 
RAM Technology  DDR SDRAM 
Max Supported RAM  1.024 GB 
RAM Speed  266 MHz 
Installed Cache Memory  1024 KB 

Hard Drive
Hard Drive Capacity  40 GB 
Storage Controller Type  IDE 

Display
Display Tech  TFT Active Matrix 
Display Size  12.1 in. 
Display Color Support  24-bit (16.7 million colors) 
Display Max. Resolution  1024 x 768 

Video
Graphic Processor  ATI MOBILITY RADEON 
Installed Video Memory  16 MB 
Graphic Bus Interface  AGP x4 
External Video Resolution  2048 x 1536 

Audio
Audio Output Type  Sound card 
Audio Input Type  Line In (3.5mm) • Microphone 

Operating System
Operating System  Microsoft Windows XP Professional 
Recommended Use  Small Business 
Platform  PC 

Technical Features
Expandability  Docking Station/Port Replicator   
Expansion Ports  2 x USB 2.0, 1 x IEEE 1394a (FireWire), VGA out, Parallel Port, RJ-11 (modem), RJ-45 (NIC) 
Security Features  HDD Password, IBM Embedded Security Subsystem 2.0, IBM Security Slot 
Input Method  Keyboard • Trackpoint 

Networking
Networking Type  Integrated Network Card 
Data Link Protocol  Bluetooth • Ethernet • Fast Ethernet • Gigabit Ethernet • IEEE 802.11a • IEEE 802.11b 

Modem
Modem Type  Network / Modem Combo 
Analog Modulation Protocol  ITU V.90 

Battery
Battery Run Time  5.5 Hour(s). 
Battery Technology  Lithium ion 

Dimensions
Width  10.76 in. 
Depth  8.79 in. 
Height  1.18 in. 
Weight  3.53 lb. 

Warranty
Warranty  3 Years 

Review

Pros: Small, fast, incredible battery life, superb build quality
Cons: Expensive
Bottom Line: Small, light, powerful and exquisitely built, this is simply the finest ultraportable laptop on the planet.

Source:
http://www.dealtime.com