2M on the box means the cable length of the sensor, not detection range.
Manual not updated and 4m on the manual is not correct.
Retro-reflective sensor for gate opener, boom barrier:
For the power supply, there are 2V/24VDC version:
When installing it, make sure no sunshine interference:
-- Light resource: Infrared LED
-- Strong anti-shock and anti-vibration.
-- Non-contact object detect: Avoid the photoelectric sensor to contact the object directly, protect the inducing component from damage and extend the operation life of the sensor.
-- Detect any objects with different materials: Detect objects by the light quantities reflected and received, detect objects such as glass, metal, plastic, wood, fluid...etc.
-- Fast response: Max. 3ms
-- Identify object colors: According to the colors' reflectivity and absorptive, the sensors detect the light that the object reflected and identify the colors.
-- High precision: Precise electron circuit can detect tiny objects with accurate position.