This design has a threshold label on the master control:+,-. Ultrasonic alarm initial value is 20 cm, you can use the two buttons Setting the threshold value. Voice part: you can record yourself, according to the recording key not to put, you start to speak, speak when loosen the button, after the record End of the sound. LCD screen display A, B, C three areas of ultrasonic measurement distance, the lower right corner there is A letter, according to the letter said Which region of ultrasonic measurement of concrete is less than the threshold, and broadcast voice of the region.

超声波语音
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