The Anti-Peeping Code System of the Keyless Entry Door Lock Deadbolt Protects Your Privacy To get rid of the embarrassment of covering the keypad in front of your friend, the smart system of the keypad door lock with handle and deadbolt helps you. You can input random digits before or after (or both) your 6-digit real passcode, totally no more than 12 digits, to prevent peeping. It's sure that the keypad deadbolt will make you feel more secure and safe. Specifications: Material: Zinc Alloy Weight: 1.8lb Fingerprint Capacity: 50 Groups Unlock Ways: Fingerprint +Anti-peeping Numeric Keypad+ Mechanical key Applicable Door Thickness: 1.18 - 2.56 inches (30-65 mm) Fingerprint Acquisition Time: ≤0.2s Working Temperature: -4°F（-20℃）- 140°F（60℃） Emergency Power Supply: USB Battery: 4 AAA Batteries(not included)