| Features | Deltabell X (Grade 2) | Deltabell X (Grade 3) | Deltabell Plus (Grade 2) | Deltabell Plus (Grade 3) | Deltabell E (Grade 2) | Deltabell E (Grade 3) |
| Fully backlit base |  | |  | | | |
| Piezo sounders with high decibel output | | | | | | |
| 3 Way tamper action | | | | | | |
| Positive/Negative trigger inputs | | | | | | |
| Universal triggering inputs | | | | | | |
| Revolving guide holes | | | | | | |
| Supplied with battery | | | | | | |
| Siren cut-off timer | | | | | | |
| 3mm Poly housing | | | | | | |
| Engineer hold off facility | | | | | | |
| Remote engineer hold off | | | | | | |
| Twin piezo | | | | | | |
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