Letterbox lock basic guide

Step 1: Open up the lock using a pin, then rotate the lock body and pull. (Refer to the diagram above)

Step 2: Take out the battery box, replace the battery and slot it back into the letterbox lock. (Refer to the diagram above)

You can power the Letterbox lock using a CR2450 3V battery. Only one CR2450 3V battery is needed to power the lock, and it will last for up to 1,200 unlocks.

*Do not attempt to use batteries other than the CR2450 3V.

Anti-Theft Mode
Anti-Theft Mode allows you to unlock by entering any combination of digits (maximum of 16) before your actual input password to fool potential thieves who may be peeking at your device.

Activating Anti-Theft Mode
1. Enter the admin password and press OK
2. You will hear a beep, and the PRISM+ logo will turn green
3. Hold the OK button for 2 seconds
4. The PRISM+ logo will begin to flash
5. Press OK again
6. Press “4” and “2”, and “OK”
7. You will hear a beep. Anti-Theft Mode is now activated

Deactivating Anti-Theft Mode
1. Enter the admin password and press OK
2. You will hear a beep, and the PRISM+ logo will turn green
3. Hold the OK button for 2 seconds
4. The PRISM+ logo will begin to flash
5. Press OK again
6. Press “4” and “1”, and “OK”
7. You will hear a beep. Anti-Theft Mode is now deactivated

Your device consists of TWO passwords: the input password and the admin password.
You are advised to change both when using the product for the first time.

Input Password	Admin Password
Used for unlocking & locking Factory Default Input Password: 1234	Used to activate different modes Factory Default Admin Password: 4321

1. Enter the current input or admin password and press OK
2. You will hear a beep sound, and the PRISM+ logo will turn green
3. Press and hold OK for 2 seconds
4. You will see the PRISM+ logo flashing
5. Enter your desired password and press OK
6. You will hear a beep, confirming the new password
7. You may restart this process to change your other password

Locking
1. Rotate the knob clockwise back into its original position
2. The PRISM+ logo will turn red

Unlocking
1. To unlock the device, enter the password and press OK
2. You will hear a beep, and the PRISM+ logo will turn green
3. Rotate the knob counter-clockwise within 3 secs to open
4. You will hear 3 beeps if you enter an incorrect password

Forgetting Your Password

• If you enter the wrong password 4 times, the lock will be deactivated for 60 seconds as a safety precaution.
• If you forget your input password, you may use the admin password to unlock. Doing so will automatically reset your input password to factory settings (1234).
• However, if you forget both passwords, search for the serial code on the side of the lock. Contact PRISM+ and provide this code, and a unique unlock code will be provided to you to unlock the device. Doing so will revert both the input and admin password to its factory default (1234 & 4231).

Low Battery

• When your device battery is low, you will see the PRISM+ logo flashing in red.
• If the battery is too low to operate the lock, you will need to power the device through its USB Type-C port in order to open the lock.

When entering the password, a beep is heard, but the lock cannot be opened

• Your knob is likely not in the correct position. Simply turning it in the right direction should resolve the issue.

No light, no sound

• Try powering the device through the USB Type-C port. If it does not power up, it is likely defective. Please reach out to us for further assistance.