Mechanical Keyless Entry Door Lock, 2.0 Code Upgrade, 4-7 Digits Code, Single-Sided Push Button Combination Mechanical Keypad Door Knob, Auto Locking, for Garden Gates, Indoor or Outdoor, SilverProduct Features Upgraded 2. 0 Mechanical Lock Keypad Update your code directly using the handle and keypad without removing the lock. Unlock with a simple mechanical codeno electronics to worry about, and clear input with the C key for quick corrections Reliable Security without Batteries This single sided mechanical keyless door lock operates without batteries or wiring. It supports 4 7 digit codes using numbers and the letters X and Z, with any