. 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; professional installation is strongly recommended. Please verify the item compatibility before purchase. Product may vary slightly between batches, including minor color or design differences, which do not affect functionality. Color: As shown Material: Plastic Package Contents: 1 x QRB1 Flame Detector Photosensitive Only the above package content; other items are not included. Note: Lighting and display settings may cause slight color variations between the image and the actual product. Measurement error allowance: +/- 1-3 cm.