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In many instances you may not need to have a full set of multimedia speakers on your PC such as in an office environment. With this internal speaker installed you can still hear the PC boots codes as it boots to be sure everything is working correctly. You can also hear the confirmation beeps when you insert USB devices.
1 short: boot normal
1 short 1 short 1 short: initialization 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: ROM BIOS checksum error
1 short 2 short 1 short: System clock error
1 short 2 short 2 short: DMA initialization failure
1 short 2 short 3 short: DMA page register error
1 short 3 short 1 short: RAM refresh error
1 short 3 short 2 short: Basic memory error
1 Short 3 Short 3 short: Basic memory error
1 Short 4 Short 1 Short: basic memory address line error
1 Short 4 Short 2 Short: basic memory parity error
1 Short 4 Short 3 Short: EISA timing error
1 Short 4 Short 4 Short: EISA NMI port error
2 short 1 short 1 short: before the 64K base memory error
3 short 1 short 1 short: DMA register error
3 Short 1 Short 2 Short: Master DMA register error
3 short 1 short 3 short: main interrupt handling register error
3 short 1 short 4 short: slave interrupt handling register error
3 short 2 short 4 short: Keyboard controller error
3 short 1 short 3 short: main interrupt handling error register
3 short 4 short 2 short: display error
3 short 4 short 3 short: clock error
4 Short 2 Short 2 Short: shutdown error
4 short 2 short 3 short: Gate A20 error
4 Short 2 Short 4 Short: protected mode interrupt error

Internal PC motherboard speaker used to hear post code beeps
Aprox 3 inch long cable, reduces PC wiring clutter
Plugs onto the Speaker header connection on the motherboard