| Manufacturer | Part Number | Description |
|---|---|---|
| ETC Unknown Manufacturer | CD2399GP | Echo Processor |
| ETC Unknown Manufacturer | CD2399 | Surround Reverb sound processor |
| YONGFUKANG YONGFUKANG | CD2399 | Audio reverberation |
| ETC Unknown Manufacturer | CD2399MN | Surround Reverb sound processor |