<ul><li>The is positive, the black line is negative.</li><li>Speaker connector for connecting the front panel of the motherboard.</li><li>Range of use: After the computer is powered on, we all hear a familiar "beep" sound, which means the computer can be used normally. This sound is sent from this "baby".</li><li>The buzzer sounds can determine the working status of the motherboard</li></ul> BTuregsau Colour:Black Material:plastic Size:6CM Package Contents: 15x Buzzer Beeper Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.

BTuregsau 15Pcs Motherboard Speaker Buzzer PC Computer Motherboard Internal Beep Buzzer for Computer Repair