Before using the unit, you need to put the LOCK-switch to position "ON" (green). In "OFF" (red) - position the Bluetooth function is deactivated and all buttons are locked.
Press and hold the S-button for at least 3 seconds. Press the M-button to adjust the actual month. Press the S-button to confirm the setting.
Proceed accordingly for the input of day, year, hour and minute (as described before).
On completion of the date and time setting, "Ok" appears on the display.