Compatibility Enhanced: Specifically designed for Linear and for-O- 3 systems, this remote is compatible with 310MHz receivers and 8 DIP switches. Suitable models include -2, DR3A, -4, DRA, DRA-4, DRQP, and more. It replaces Linear models and for-O- code switch models. Note: This is not a universal remote; compatibility with existing 8 dip switches and 310MHz frequency is required. Advanced Wireless Technology: This upgraded remote offers superior wireless performance with robust signal coverage and mission capacity, ensuring enhanced safety and reliability. It's the perfect replacement for older Linear remotes, providing peace of mind thanks to its advanced technology. Construction: Crafted from high-quality plastic material and featuring an upgraded internal chip, this remote is built to last. It has undergone extensive testing for durability and performance, outlasting previous versions and offering reliable operation. The actual product may have slight color differences, which do not affect use. Color: Black. Material: Plastic. Package Contents: 2 x garage door remote. Only the above package content is included; other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture to appear slightly different from the real thing. The measurement allowed error is +/- 1-3cm.