. Made of high-quality materials for maximum durability and reliability. Seamless fit. Easy to install, no complicated tools required, easy to use. Professional workmanship, exquisite design, novel style. Type: QRB1 Flame Detector Photosensitive Electric Eye Burner Detection Photoresistor For Burner Waste Oil Note: Installation guide not included; we strongly recommend professional installation. Please check as much as possible to make sure the item is what you need. Tips: The product may be updated constantly due to different batches. The actual product may have slight differences or color variations, which do not affect use. Color: As shown Material: Plastic Package Contents: 1 x QRB1 Flame Detector Photosensitive 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 to be slightly different from the real thing. The measurement allowed error is +/- 1-3 cm.