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The Westinghouse RTS-PZA Commercial Lever Lock requires four AA Alkaline batteries.
To replace the batteries in an RTS lock:
- Remove the battery cover.

- Insert four new AA batteries.

- Reinstall the battery cover.

- Press [M] on the inner keypad of the RTS to initialize the lock and display the current battery voltage.

- When power is applied to the lock, it will beep twice to indicate that it is ready to be programmed.