This product is a wireless remote control key designed for remote control equipment such as rolling shutter doors and garage doors within a range of 50m-100m in free space. It offers a convenient and reliable remote control experience for daily use. NOTE: Please ensure that your receiver is functioning properly before purchase, as this product must be paired with your existing receiver. Disclaimer: Your remote control must match the image and specifications provided, and the brand and model must be included in the store's compatibility list. Frequency: 433MHz Code: Rolling code Buttons: 4 Battery: Battery included Operating Distance: 50m-100m Application: Garage door, alarm system, automatic door, rolling shutter door, etc. Weight: 0.027 kg Dimensions: 6.8 x 4.0 x 0.9 cm Color: Black Material: ABS Package Contents: 1 x Remote Control Note: Light reflection and differences in display screens may cause slight variations in color between the product image and the actual item. Measurement may vary by +/- 1-3 cm.