Etymotic Research ER4P MicroPro Noise-Isolating In-Ear Earphones (Discontinued by Manufacturer)
| Country | USA |
| Brand | Royal |
| Manufacturer | Royal |
| Binding | Electronics |
| ItemPartNumber | 29297W |
| Model | 29297W |
| UnitCount | 2 |
| UPCs | 022447292978 |
| EANs | 0022447292978 |
| ReleaseDate | 0000-00-00 |