Found a Sony D-E307CK for $1 today- a Discman model from 1997.

The design of the D-E307CK is typical of 1997-1998 Discman models with a display and buttons around the front

It's finished in a classic Discman two-tone color-silver and black and has a good feel to it-even though it's constructed out of plastic and as it's a "car-ready", the lid is heat-resistant.

A small window on the top lets you see the CD spinning-a nice touch, which is also present on the D-181.

There are twelve controls on the D-E307CK and are:hold, play mode,AVLS,repeat/enter,previous,next,stop, play/pause,open.

The D-E307CK's display can show the track number/time elapsed, sound mode,playback mode, battery status and repeat.

Unlike with the D-181 from the next year, D-E307CK has ESP-so it's less prone to skipping and ESP is very effective.

AVLS (volume limiting) is present and its switch is on the bottom-a very good design choice.

Playback modes are:repeat,shuffle,intro PGM,RMS (program),1.

Repeat playback mode is via the REPEAT/ENTER button, wheras the others are selected using PLAY MODE.

The D-E307CK features Digital MEGA BASS (two-stage with "volume graph" display style).
Sound quality is very nice.
Line-out
Yes, the D-E307 has a line-out jack at the rear
Remotes
Yes-there is a combo headphone/remote jack.

Photo:

Nice find for 1bug!
Everything works?

yes, everything works fine