BLUETOOTH LOCK: No key or combination, your smartphone opens your connected padlock; ideal solution for people who always forget their keys or combination; outdoor or indoor use MASTER LOCK VAULT HOME APP: New version free app for Android and iOS to manage and schedule the padlock access, monitor activity, receive tamper and low-battery alerts (no fees and no long-term contracts) EASE OF USE: Use your smartphone to unlock padlock or enter the directional back-up code for easy backup without smartphone DURABLE DESIGN: Metal lock body for durability ; two-piece weather cover for maximum outdoor protection; boron alloy shackle offering maximum resistance to cutting and sawing BATTERY INCLUDED: Bluetooth lock comes with easy to replace CR2 battery, plus low battery notification and reminder on padlock and in app ensures you always have access, Weight: 0.8267334825 pounds, Manufacturer: Master Lock