EASE OF USE: resettable 4 digit combination for keyless convenience and large light up dials for better visibility in low light conditions. Large open lever for more comfortable use. LOCK BOX APPLICATION: For indoor and outdoor use, flexible key box with shackle, large Internal cavity allows secure storage for multiple keys and access cards. DURABLE DESIGN: the key safe has a metal body and a weather cover for durability, the shackle is covered with vinyl to prevent from scratching. GREAT FLEXIBILITY: portable model with shackle, can be placed on doors, barriers, portals or fences. Very convenient for collective ownership and rental as no need to fix it to the wall. SHARE YOUR KEYS: great solution for Airbnb and home rental, ideal to share keys with your family, roomates, care takers and home workers. SPECIFICATIONS: (H x W x D) exterior dimensions 17.5 x 7.2 x 5.2 cm, interior dimensions 8.8 x 5.7 x3.2 cm, replaceable CR2032 battery (included)., Weight: 1.2676580065 pounds, Manufacturer: Master Lock