One memory expansion slot.

There are two versions of 2300c which Apple is making available. The first has 8MB of memory soldered to the motherboard. The second version has the same 8MB of RAM soldered but also includes a 12MB memory module. Any further memory upgrading in this second version of the 2300c will require the removal of the 12MB memory module.

This Mac contains 2048K ROMs,  and an Apple 1.44MB SuperDrive that uses high-density floppy disks and reads, writes, and formats Macintosh, Windows, MS-DOS, OS/2, and ProDOS disks.

Serial Port with the phone icon supports synchronous modems, with handshaking on both the output and input.

Sound output is stereo.

Contains an international power supply.

Contains a 152-pin processor-direct slot (PDS) connector for connecting PowerBook Duo Docking Bars. Newer Technology makes the following Docking Bars:
Part # 7MD-S ----- SCSI MicroDock w/ ADB
Part # 7MD-F ----- Floppy MicroDock w/ ADB 
Part # 7MB-P ----- PC Card MicroDock w/ ADB
Part # 7MD-E ----- Ethernet MicroDock w/ ADB
Part # 7MD-C ----- Color MicroDock w/ Audio & ADB
Part # 7UD16SC ---16sc UltraDock w/ SCSI, Color, Floppy, Audio & ADB
Part # 7UD16SCE --16sce UltraDock w/ SCSI, Color, Ethernet, Floppy, Audio & ADB

The 2300c has a new keyboard and improved Apple trackpad.
Built-in, 2.4-mm travel, 18-mm pitch keyboard, with integrated palm rests, and two-level tilt adjustment. Solid-state improved Apple trackpad lets you use the trackpad to select, open or close, and drag without using the trackpad button.