PADLOCK APPLICATION: For indoor use; Compact design is best used as a locker lock, indoor cabinet lock, storage lock and more. 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 body construction, boron carbide shackle, and anti-shim locking mechanism for improved strength and security; plus military-grade Bluetooth authentication and encryption 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. SPECIFICATIONS: padlock (H x W x D) 10,5 x 4,7 x 2,8 cm ; shackle (A x B x C) 0,7 x 2,2 x 2 cm included components: 1 Bluetooth Padlock, Weight: 0.4739938633 pounds, Manufacturer: Master Lock