The Anderic 850LM Garage Door Kit is a compatible substitute for the Allstar A9921T 318MHz binary dip switch remote, designed to work seamlessly with your existing garage door opener system. This complete kit includes everything needed for installation and operation, eliminating the need for additional components or accessories. The 850LM operates on the same 318MHz frequency and binary dip switch technology as the original, ensuring reliable performance and compatibility. Choose the 850LM as a dependable replacement that delivers the same functionality at a practical price point.