 
					| Mfr. Part No. | Description | 
| E3X-DA21-S | Standard models, Red,4-element LED | 
| E3X-DA0-S | Model for Sensor Communications Unit, Red,4-element LED | 
| E3X-DA51R-S | Ultra-long-term APC models, Red,4-element LED | 
| E3X-DA7F-S | High-speed response models, Red,4-element LED |