When the PT-500 is switched on and the Lithium battery is discharged, the following low backup battery warning message will be displayed on the PT-500 LCD:

BACKUP BATTERY LOW!

In this situation you should upload your data from the PT- 500 to a PC and have the Lithium battery replaced. Contact your local sales or service representative for replacement of the Lithium battery.

Note: Data may not be backed up and data loss may occur if both the main battery and the Lithium battery are discharged.

2.3 Using the Keypad

The Keypad of the PT-500 consists of 36 rubber keys and one large scanner trigger button. The keypad layout is shown in the following picture.

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Unitech PT-500 manual Using the Keypad