... ultrasonic sensors, temperature sensors, ultrasonic servo circuit, display, control signal output, the transmitter circuit as a whole, using SMD ... or a M49 × 1.5's gong jack.Ultrasonic Sensor Main technical characteristics: 1, non-contact measurement, environmental protection ... resolution: d = 1mm/1cm calibrated settings Keyboard: 3 Waterproof touch keys Data Output: Current: 4 ~ 20mA or 0 ~ 20mA ...