Item Descriptions:-Mainboard Connector Type: 4 pin, body size: 11.8x 8mm / 0.46inch x 0.3ich, total length: 6cm/2.4inch.-Working Principle: The working state of the motherboard can be judged by the sound made by the buzzer.-Compliant: Plugs right Into your motherboard where the speaker hooks up and is sufficiently short to reduce clutter within the PC from excess cables.The red wire is the positive pole and the black wire is the negative pole.-Repalcement: Super small mini Piezo speakers is better repalcement motherboard speaker alarm beeper buzzer for your PC computer system.-Notice:-1 short: the system starts normally, this is something we can hear every day, it also shows that the machine has no problems.-2 short: general error, please enter CMOS setup and reset incorrect options.-1 long and 1 short: RAM or motherboard error, try a new memory, if it still does not work, but had to replace the motherboard.-1 long 2 short: the display or video card is wrong.-1 long 3 short: keyboard controller error, check the motherboard.Package:20pcs Computer BuzzerItem Specifications:Length:6cm/2.4inchVoltage:12VColour:Black, redConnector Type:4 Pin