4. The produced beam provides a self-checking function for the sliding door. Once the self-test beam is interrupted, the door stop closing and quickly reverse to its maximum width. The door remain open until the detection beam is restored. When the door is fully closed, the detection beam is invalid 2. Can avoid interference from external light 3. Even if installed at a lower height (20-40 cm from the floor), the detection distance (5-15 meters) can be guaranteed. 1. Composed of a transmitter and a receiver, the integrated amplifier can generate an infrared beam. 5. Used for automatic sliding doors, automatic doors, rolling doors, garage doors, , guardrails, Weight: 0.30423792156 pounds, Manufacturer: Tuidzljd