Theoretically the reception distance is about 5-8 meters, but the practical application depends on the ambient factors you use, as well as the middle barrier (such as diaphragm, glass, obstructions or other blockage of material) .
features:
Sensor hx1838. High sensitivity.
Operating voltage 5V.
Output type: digital output.
VCC: 3.3v-5v external voltage (can be connected directly to the 5v microcontroller and 3.3v microcontroller).
GND: External GND.
External microcontroller i / o port, I / O port has been designed 10k pull-up resistor.
