LOCK BOX APPLICATION: for indoor and outdoor use; wall mount lockable key box is best used for Key and access card storage; Large Internal cavity allows secure storage for multiple keys EASE OF USE: resettable 4 digit combination for keyless convenience; Large open lever for more comfortable use LIGHT UP DIALS: Large easy to read light up dials for better visibility in low light conditions; dials light up automatically each time the weather cover is opened DURABLE DESIGN: key safe designed for permanent installation; metal body and weather cover for durability SPECIFICATIONS: 72mm wide lock body with interior dimensions of 106mm H x 60mm W x 25mm D; replaceable CR2032 battery (installed), Weight: 0.9700339528 Pounds, Manufacturer: Master Lock