Sony PCV-LX920 - Manual (Page 23)

Identifying Components 11
Phone, Line In, and Mic Connectors
The phone (headphones), line in, and microphone jacks are physically
identical, but have different connections. They are standard 3.5 mm stereo
mini-jacks and are located on the rear panel.
Connector Description
Phone 1.0 Vrms output (typical) at 31 mW (32 ohm) output (max).
Line In 2.0 Vrms input (max), 50 Kohm impedance.
Mic Electret condenser microphone input.
Phone
Line In
Mic