Skylink KN-1 Universal Wireless Garage Door Opener Keyless Entry Transmitter Keypad System Easy one step installation - simply replaces or parallels your traditional wall button with smart button receiver. Wireless keypad is operated by one low cost aaa alkaline battery ( Universal - works with most national brand garage door openers. Backlit keypad makes it easy to see the numbers to access your garage in the night time. Water resistant design, the weather-proof cover protects the keypad from wet and windy weather conditions. Passcode lock timeout - keypad will automatically lock for 10 minutes after ten incorrect passcode attempts.