1、You can check your computer by our POST and don't have to open motherboard 2、We have specification for POST card. If you don't know how to do, you can follow the lead. English and Chinese 3、We have description of LED displays and you can see Error code table to check your computer 4、With alarm voice, you can know where you get wrong 5、If you forget your password. Don't worry about it. Omnipotent password and Discharge by software can help you to solve it Description: The Card is named POST (Power On Self Test) card too. It could display the error code by the result of POST. Then you would soon determine system, or blank screen. You can check your computer by our POST and don't have to open motherboard. We have specification for POST card. If you don't know how to do, you can follow the lead. English and Chinese. We have description of LED displays and you can see Error code table to check your computer. With alarm voice, you can know where you get wrong. If you forget your password. Don't worry about it. Omnipotent password and Discharge by software can help you to solve it. Specifications: Size: 7.9cm * 5.8cm (not include LED size) LED Size: app. 5.2cm*2cm*0.7cm Color: Red Suitable Type: PHOENIXBIOS4.01 TO 6.0 BOIS PC AND DESKTOP AMIBIOS6.24 AWARDBIOS4.51 BOIS PC AND DESKTOP IBM T20 T21 T22 T23 A21 A22 A20 DELL640 TOSHIBA 4030 etc. Package Included: 1 * Card with English instructions