Eco-friendly housing: The product features an improved design with a shell made of reinforced plastic, offering durability, strong compression resistance, anti-drop, and anti-corrosion properties. Intelligent safety remote control: In case of remote control loss, the device includes a learning key to delete the lost remote handle at any time. Additional remote handles can also be added as needed. Million passwords: Capable of reading up to 20 million passwords, the device can learn up to 20 remote control signals with one-key quick switching and fast response speed, achieving 0.06 seconds per key response. Color: Black Material: Plastic Package Contents: 1 x External Motor Chain Rolling Door Receiver, 2 x Remote Controls Note: The package includes only the items listed above. Other products are not included. Due to light reflection and differences in display screens, the color of the item in the image may vary slightly from the actual product. Measurement error allowance is +/- 1-3 cm.