The Yoga Timer ASANA features two functions:
When the switch in the back is in the upper position, the acoustic signal is activated (with a gentle beep). After the set time has been run out, it gives only one single "beep". Therefore this yoga timer doesn't need to be switched off at the end of the excersise or meditation.
When the switch in the back is in the lower position, the optical signal is activated, and the acoustic signal is deactivated. When the set time has run out, the red LED (at the front of the timer) is blinking for about 60 seconds. Meanwhile, the Yoga timer ASANA is counting upwards.