2M on the box meansthe 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 110V/220V version and 12V/24VDC version; 2M on the package means the cable length of the sensor, not for detection range., Weight: 2.20462262 Pounds, Manufacturer: JVDDI
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