General description YMYNY 433 MHz 2-Pack Universal Replacement Remote Control is designed for electric garage doors and other applications. Each remote features four buttons, allowing you to copy four different chip types, enabling control over multiple structures with a single device, which can save you money. Technical specifications Frequency: 433 MHz Transmission distance: 50-100 m (in open space) Channels: 4 Usage Compatible with cars, roofs, garage doors, gates, alarm systems, heating systems, and home automation. High copy accuracy and efficiency for easy operation.