General description You will receive 4 pieces of garage door opener remote controls compatible with the M12 garage door remote transmitter for automatic swing and sliding door openers. These wireless transmitter keychain security door controllers meet your usage needs and operate effectively. Technical specifications Compatibility: M12 garage door remote transmitter Operating frequency: 433.92 MHz Range: Up to 200 feet Battery: Built-in dry battery with low power consumption for long battery life Measurement allowed error: +/- 1-3 cm Material: ABS Compatibility and accessories Can operate multiple door openers within control range Control up to four swing door openers and one sliding door motor Control two sliding door motors by adding two ERM12 on each control board Usage Ensure the garage door opener is completely closed before starting remote programming Simple programming with clear instructions Other information Color: As shown Note: Due to different production batches, the color