PC computer case internal alarm speaker beep beep sound.Super small mini piezo speakers for pc computer motherboard,length is 2.36".Compatible Plug-n-Play,very easy to install on motherboard.Best repalcement of motherboard beeper alarm speaker for your PC computer system.Package content: Pack of 10 motherboard speakers.Internal PC motherboard speaker, in many cases it may not be necessary to have a full set of multimedia speakers in your PC, for example in an office environment. With this internal speaker installed, you can still hear PC boot codes to ensure everything is working properly. 1 short: normal boot 1 short 1 short 1 short: boot system power failure 1 short 1 short 2 short: motherboard error 1 short 1 short 3 short: CMOS battery failure or 1 short 1 short 4 short: BIOS ROM checksum error 1 short 2 short 1 short: system clock error 1 short 2 short 2 short : DMA1 initialization failure short 2 short 3 short: DMA page register error1 short 3 short 1 short: RAM refresh error1 short 3 short 2 short: base memory error1 short 3 short 3 short: base memory1 short 4 short 1 short: address line error base memory1 short 4 short 2 short: parity error base memory1 short 4 short 3 short: EISA synchronization error1 short 4 short 4 short: EISA port error NMI2 short 1 short 1 short: before 64K base memory error3 short 1 short 1 short: DMA3 register error short 1 short 2 short: master register error DMA3 short 1 short 3 short: interrupt handling register error main3 short 1 short 4 short: slave interrupt handling register error3 short 2 short 4 short: keyboard controller error3 short 1 short 3 short: main interrupt handling register error3 short 4 short 2 short: display error3 short 4 short 3 short Note: The data are all manual measurement, please allow 1-3cm error, due to the light and display difference, there will be some difference color, depending on the physical item received.