1.The standard password is "0000", enter it and unlock it when the music is playing.
2. Press and hold the “*” button for 3 seconds immediately before unlocking.
3. You will have to enter your 4-digit password for 10 seconds. If the number entered exceeds 4 digits, only the first 4 inputs will be valid. Press "#" to confirm the new password and save it.
4. If you forget your password, please press “1”, “3” and “0” for 4 seconds at the same time. You can change your password by following steps 2 and 3.
5. When the battery is exhausted, you can change them by a screwer.