Ultrasonic sensor moudle Low cost, small size, switching signal output For alarm system, ... a single transmit & receiving sensor, working with the application circuit, it can detect moving or static obstacle, and the distance ... system, proximity switch etc.3. Parameters ITEMSPARAMETERTOLERANCENOTEVOLTAGE1.Low voltage version DC 5-7V2. Normal voltage version DC 8-16V FREQUENCY40KHZ±1KHz WORKING ...