It can clone remote controls with fixed codes for various 433MHz (433.92MHz) frequencies (rolling codes cannot be cloned). Suitable for many kinds of cars, electric doors, gates, garage doors and burglar alarms, etc. Button slide cover protects buttons from accidental and unintentional operation Convenient key chain that can be easily hung on car keys for easy carrying. 4-button design allows you to control up to 4 garage door openers or gate systems at the same time. . This product allows you to clone 2 additional remotes for your family or just to use alternately. the 4 button design allows you to control 4 garage door openers or gate systems at one time. Specification. Operating Frequency: 433 (433.92) MHz Rated voltage: 12V Rated current: 14mA Size: 35.1*85.80mm Color: Black Package included. 2 remote key fobs