How to set time :

1. Press button A for 3 second to enter to set hour mode, then press button A for one second to set hour;2. After setting hour, press button A for 3 second to enter to set minute mode, then press button A for one second to set minute3. After setting minute, press button A for 3 second to enter to set month mode, then press button A for one second to set month;4. After setting month, press button A for 3 second to enter to set date mode, then press button A for one second to set date;5. After setting date, press button A for 3 second to enter to set year mode, then press button A for one second to set year