Background self-learning function. Active infrared technology with anti-interference self-adjustment capability. The motion radar with unidirectional function can save more resources; 3-D safety light curtain , no additional safety sensor is needed. Both two functions of start-up and anti-pinch. Multi- technology is used for the combination of opening automatic doors and making them safe. These multi- sensors also fulfil a number of additional functions which can significantly increase the convenience of the door. Model Number: CNB-235 Application: Hotel/building/office/mall/hospital/cleanroom etc Power input: AC/DC 12V~24V Working temperature: -20~55 Sensor Distance: 2500mm Material: Metal+plastic colour: Silver Package Contents: 1 x Multi- 2 in 1 door sensor Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.