The Handspring Visorphone was a cellular phone attachment marketed for the Handspring Visor series of handhelds. After Handspring's merger with Palm in 2003, it became difficult to obtain replacements.
| Pin Number |
Pin Name |
Description (may be empty) |
| 1 | GND | Ground |
| 2 | TEMP | Stops charging if battery temperature becomes too high |
| 3 | Vin | Lithium-ion battery, 3.6v |
| 4 | Not connected |
Pin 1 is closest to the center of the battery; Pin 4 is closest to the edge of the battery.
According to Handspring's specifications, 4 to 6 volts can be applied across Vin to charge the battery.
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