From the manufacturer

Features:

• Keyless entry: open the door with a personalized 4-digit pin without a remote control or key
• Single-use pins: program the keypad with single-use pins, perfect for one-time visitors
• Works day and night: illuminated keypad makes nighttime entry easier
• Secure access: each time the keypad is activated, a new access signal is sent from billions of possible combinations to prevent interception of the radio signal by would-be hackers
• Wire-free installation: easy to install with no wiring required