If I push the power button for 10 sec, HELLO flashes 15 times, then a whirr and a few beeps. HELLO remains on display. Pressing power button for 10 sec turns it off and displays the time. When the power button is pressed again, it does the 15 HELLOs, etc. When small reset button is pushed with pen tip, it shows one zero, then 2, 3, 4, 5, 6 zeroes and then backwards to none. It repeats this twice more, then a whirr and beeps, and display goes blank. Pressing power button for 10 sec makes it show the time.