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| SR4 Robot Features |
SR4-P |
SR4-N |
SR4-O |
 |
| Motor Wheel Base |
 |
 |
 |
 |
| Motor Controller |
 |
 |
 |
 |
| Wheel Encoders |
 |
 |
 |
 |
| Sonar Obstacle Avoidance |
 |
 |
 |
 |
| GWX Single Board Computer |
 |
 |
 |
 |
| Sensor band with impact, proximity, distance & IR sensors |
 |
 |
 |
 |
| LinkSys Wireless Ethernet Adapter |
 |
 |
 |
 |
| 4 GB USB Flash Drive |
 |
 |
 |
 |
| Robot Body & Dome |
 |
 |
 |
 |
| Triangulation Base and 2 Remote Beacon Units |
optional |
 |
- |
 |
| Voice Synthesizer and Amplified Speaker |
optional |
optional |
optional |
 |
| Additional Beacon Units |
optional |
optional |
- |
 |
| Advanced commercial-grade navigation |
- |
- |
 |
 |
| Trays for copies, mail, coffee, meals, etc. |
- |
- |
 |
 |
| |
 |
 |
 |
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