Operation mode: Low voltage alarm: When the power supply voltage is lower than 9.2V, the product enters the alarm mode and emits a warning sound. 1 Hz alarm, which will last forever. In this case, the product does not work. Power-on self-test: When the initial power is turned on, the product will enter self-inspection. First, the red light flashes three times, then the white light flashes three times, then the alarm sounds. Working process: 1-15s, the red light flashes three times, then the 12k-25kHz ultrasonic wave is emitted, accompanied by the white LED flashing. 16-30 years, relief product. 31 to 50 seconds, repeating the process for 1 to 15 seconds. 51s-1min 10s, product standby. 1min 11s-1min 40s, repeating the process for 1-15s. After performing the above actions, stop 1min. Then repeat the above actions twice, stopping at 3 minutes and 5 minutes respectively. Vibration induction: when the power supply voltage is higher than 9.2V, the product enters the working mode. When the
