Comprehensive Package Contents: Package contains 4 300 MHz dual button openers, compatible with Linear MCS412001 Multicode, 10 dip switches; Package also includes visor clips, installation instructions and built in 9V dry battery for enhanced safety User-friendly Usage Method: the garage door remote control comes with a user manual containing comprehensive instructions for usage; With the ability to quickly synchronize with your garage door system, this remote control can simultaneously manage two distinct receiver devices - such as two garage doors, or one garage door and one electric door - ensuring maximum convenience Convenient Features: The garage door opener remote operates within 120 feet of the garage door, ensuring quick access while ensuring seamless entry and exit of the garage