Description Important note: This handheld transmitter is a high-quality replacement and not a complete accessory. Please refer to the detailed compatibility list below to ensure it works with your system. Wide compatibility: The remote control operates at a frequency of 433.92 MHz and is compatible with various models, including Novotron 522, 524, 502 MAX43-2, 504 MAX43-4, as well as Tormatic and Novomatic garage door openers such as GTA 601, 802, and many others. Wide range of applications: This remote control works with several garage door openers, including Novomatic 403, 413, 423, 553, and Novoport I, II, and III. It offers a reliable solution compatible with a variety of garage door systems. Convenient and compact design: Thanks to its small size, the handheld transmitter can be easily attached to your keychain with the included keyring for convenient portability. Scope of delivery and ease of use: The package includes 2 remote controls, a practical strap, and a user manual (French not guaranteed), allowing for quick and easy installation.