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| PartNumber | WR21-U91B-DE1-SF | WR21-U91B-DE1-SU | WR21-U91B-DE1-SL |
| Description | Routers HSPA+ 1 Ethernet RS232 | Routers HSPA+ 1 Ethernet RS232 | Routers HSPA+ 1 Ethernet RS232 |
| Manufacturer | Digi International | Digi International | Digi International |
| Product Category | Routers | Routers | Routers |
| Series | WR21 | WR21 | WR21 |
| Brand | Digi International | Digi International | Digi International |
| Product Type | Routers | Routers | Routers |
| Factory Pack Quantity | 1 | 1 | 1 |
| Subcategory | Ethernet & Communication Modules | Ethernet & Communication Modules | Ethernet & Communication Modules |
| Tradename | TransPort | TransPort | TransPort |
| Unit Weight | 1.080 lbs | 1.080 lbs | 1.080 lbs |