Package List: 4 pieces of garage door opener remote control compatible with M12 garage door remote transmitter for automatic swing and sliding door openers, wireless transmitter keychain security door controller. Compatibility and Control: Compatible with M12 garage door remote transmitter for automatic swing and sliding door openers. Each 4-button wireless keychain controller can operate multiple door openers within its range. Supports configurations including four swing door openers, one sliding door motor, two swing door openers plus one sliding door motor, or two sliding door motors (when paired with two ER-M12 modules installed on the respective control boards). Safe and Reliable Operation: Designed and tested for reliable performance. Features low power consumption for extended battery life (uses built-in dry battery). Utilizes RF technology with secure encryption and rolling code technology to minimize radio interference and prevent unauthorized access. Operating range up to 200 feet. Functionality: Black remote control compatible with M12 transmitter. Operates at 433.92 MHz. Includes clear programming instructions. Ensure the garage door is fully closed before initiating remote programming. Convenient and Portable: Compact and lightweight keychain design for easy carrying—fits in handbags, wallets, pockets, and other small spaces. Delivers strong signal transmission and wide coverage for flexible, everyday use. Note: Color may vary slightly between production batches; this does not affect functionality. Color: As shown Material: ABS Package Contents: 4 × Garage door opener remotes