The Apple Microphone shipped with Macintosh LC computers and could be purchased separately. The package included a microphone and a holder with a self-adhesive back. The Microphone was an omnidirectional condenser microphone with a frequency range of 100 Hz to 10 KHz. The cable terminated in a 3.5 mm stereo plug.
The Microphone is known as a PlainTalk Microphone. The following Macs support the PlainTalk Microphone according to Apple: Quadra 605,630,660,840; Centris 660; LC 475, 605, 520, 550, 575, 580, 630; Performa 475, 476, 520, 550, 560, 575, 577, 578, 580, 588, 630, 631, 635, 636, 637, 638, 640, 5200, 5210, 5115, 5220, 5260, 5270, 5280, 5300, 5320, 5400, 5410, 5420, 5430, 5440, 6110, 6112, 6115, 6116, 6117, 6118, 6200, 6205, 6210, 6214, 6216, 6218, 6220, 6230, 6260, 6290, 6300, 6310, 6320, 6360, 6400, 6410, 6420; Network Server 500, 700; Workgroup Server 6150, 7250, 7350, 8150, 8550, 9650; G3 Server 233, 266; G4 Server 500MHz; PowerMac 4400, 5200, 5260, 5300, 5400, 5500, 6100, 6200, 6300, 6400, 6500, 7100, 7200, 7215, 7220, 7300, 7500, 7600, 8100, 8115, 8200, 8500, 8515, 8600, 9500, 9515, 9600; PowerMac G3 Beige Desktop & Mini Tower, G3 Blue & White; Twentieth Anniversary Mac; iMac G3; and PowerMac G4 PCI, AGP, GE.
I have two different versions of the packaging for these microphones. The white box is from 1990 and the brown cardboard box version is from 1991. The part number on the box is 699-5103-A.
Sources: applemacparts.co.uk, Wikipedia.org