2.36-2.76in Adjustable Locking Tongue Smart Password Keypad Anti Theft Electronic Door Lock with 2 Keys (Silver ) Item Type: Door lock User Capacity: Built-In 50 sets of passwords Password Length: 4-8 digits Number of Pressing Password: 100,000 times Battery Life of the Product: 365 days Door Opening Method: Password, spare mechanical key Door Opening Direction: Regardless of the left and right direction Power Supply: 4 AA alkaline batteries (6V) (not included) Standby Current: 15μA-30μA Working Current: 200mA Working Temperature: -15 - 50 °C Working Humidity(RH): (45-85)% Material: Zinc alloy front panel, plastic rear panel Lock Tongue Material: Stainless steel Size of Lock Tongue: Approx. 60-70mm/2.36-2.76in(adjustable) Applicable Door Thickness: Approx.35-55mm/1.38-2.17inFront Lock Plate Size: Approx.61x140.2mm/2.4x5.5in Rear Lock Plate Size: Approx.71.8x162.2mm/2.8x6.4in Thickness of Front Lock Plate: Approx.29.3mm/1.2in Thickness of Rear Lock Plate: Approx.52.3mm/2.1in