| FEATURE | ST-101B | ST-102B |
| Rated operating voltage | 110 – 125 V AC | |
| Wattage | 0.3 W | |
| Actuator | NA | Black button |
| Indicator lamps | Three, incandescent | Red LED, three lights, incandescent |
| Lamp lens colors | One red, two amber | |
| Light colors | Open ground, open neutral, open hot, hot/ground reverse, hot/neutral reverse, correct | |
| Safety-agency approvals | ||