TYPE: 5PCS PC computer motherboard alarm buzzer, length 2.3 inches | USES: The sound made by the buzzer is used to determine the working status of the motherboard.Easy to install, 4-pin female connector, plug and play, easy to plug into the speaker connector on the front panel of the motherboard | WIRING: red positive pole, black negative pole (in fact, as long as the interface is connected to the speaker, both positive and negative poles can be used) | HOW TO USE: After turning on the computer, we will hear the familiar "beep" sound, usually indicating that the computer is working properly, the sound comes from this buzzer. If it is not normal, you can judge the fault by its sound | 100% brand new and high quality