Fangrui Product Details Fangrui Product Details No Contact, No Noise, Internal Working Method, No Spark Noise Generation. Good Optocoupler Operation For More Stable Power Cycle Capability And Excellent Temperature Characteristics. The Shell Is Made Of Transparent High-temperature Flame-retardant Material, Which Is Glossy, Heat-, Fire-, And Dustproof, Sturdy And . Solid State Relays Do Not Have Mechanical Components And Are Operated By Thyristors To Complete Contact Work. Electroplated Aluminum Plate Has Excellent Heat Dissipation. Due To Different Batches, There May Be Differences In Product Appearance And Printed Text, Which Not Affect Use. Type:40aa Colour:black Material:abs Package Contents: 1 * Solid State Relay 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. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.