Two red LED flashes, when the alarm, flashes at the same time.
Alarm switch, press the alarm once, then close the alarm again. Alarm sound 120-125dB.
The battery cover uses a CR2032 lithium battery, which needs to be pulled out before use.
Elastic arm band for easy fixing on the arm.
Especially suitable for jogging / walking / night shifts / workers / solitary elderly / lady / children.