Apple PowerBook 165 - Manual (Page 17)

Specifications I/O Devices - 8
I/O Devices
Keyboard
Built-in keyboard with standard Macintosh layout
63 keys domestic; 64 keys ISO
Two-level tilt adjustment
Trackball
30 mm diameter, dual button
ADB interface
Microphone
Electret, omnidirectional
Output voltage of 4 mV, peak to peak