Feature:1)Up to ten sets individual PIN codes.2)Two master PIN codes.3)1 digit up to 10 digits PIN code.4)PIN code of the Inside Unit option.5)Zinc Alloy material.6)Sliding weather cover - Fully resistant to rain, snow, temperature extremes, humidity,and dust.7)Multi-latch mortise.8)Battery operation with low battery alert - non-volatile memory will not delete enrolled PIN codes (even if batteries expire).9)Easy to install.10)Easy to program and operate.11)Elegant and contemporary appearance.12)One Year Warranty. producing area:China