5/10PCS Reflective Optical Sensor with Transistor Output Replacement Parts Features: 1. Reflective Optical Sensor with Transistor output 2. Available in sets of 5PCS and 10PCS, choose the set that best suits your needs. 3. Note: If you wish to replace it by yourself, please understand that we are unable to provide professional repair tools and instructional videos. Thank you for your purchase. Package Includes(Options): 5*Reflective Optical Sensor OR 10*Reflective Optical Sensor Note: 1. Please allow 1-3 mm error due to manual measurement. Please ensure you are okay with this before ordering. 2. Please allow 1-3g weight error. Please ensure you are okay with this before ordering. 3. Due to photo lighting and monitor differences, the pictures may not accurately represent the actual color of the item. Please ensure you are okay with this before ordering, thank you!