E300-KN5N50-S00 is the specific model number for the Cooler Master Elite 300 Mini Tower Case bundled with a pre-installed 500W PN500 power supply. This variant features a steel side panel and includes support for a legacy 5.25" optical disk drive (ODD).

Form Factor: Mini Tower supporting Micro-ATX and Mini-ITX motherboards.
Power Supply: Includes a Cooler Master PN500 500W PSU.
Drive Bays: Features one 5.25" ODD bay, two 3.5" drive bays, and two 2.5" SSD bays.
Cooling Support:
- Fans: Supports up to two 120mm front fans, two 120/140mm top fans (with ODD bracket removed), and one 120mm rear fan.
- Radiators: Compatible with up to 240mm radiators in the front and 280mm on top (with ODD bracket removed).
Clearances:
- GPU: Up to 365mm (without front fans/radiator).
- CPU Cooler: Up to 165.5mm height.
- PSU: Up to 160mm length.
I/O Panel: Equipped with two USB 3.2 Gen 1 Type-A ports and one 3.5mm headset jack.