This is a new Marantec 433.92MHz fixed-code remote control key fob. It is a self-copying transmitter designed to duplicate existing remotes for compatible Marantec garage door and gate openers. The unit operates on a 433.92MHz frequency and is powered by an included CR2032 battery. It is available in 2-button or 4-button configurations. Compatible models include: Marantec Digital 302, 304, 313, 321, 323, 382, 384, 211, 212, 214, 221, 222, 224, 231, 232, D302, D304, D313, Comfort 220, Comfort 250, Comfort 252, and Command 131. Please verify your original remote is on this list before purchase. Programming Instructions for Self-Copy: 1. Clear Duplicator Memory: Press and hold buttons A and B until the LED flashes three times. Release button B (keep holding A), then press button B three times slowly until the LED flashes. Release button A. 2. Copy Code from Original Transmitter: Place the duplicator next to your original transmitter. Press and hold button A on the original transmitter, then press and hold button A on the duplicator until its LED flashes. Release both buttons. Repeat this process for any other buttons you wish to copy. This versatile duplicator can create backup remotes for various systems, including vehicle central locking, garage doors, electronic gates, home automation, car sunroofs, and alarms. Package includes: Remote control, battery, and an English manual.