Large Push Button Cover Lockout Box Type TRADESAFE Buy Emergency Push Button Style 2 The Lock Box Portable Lock Box, Push Button 5422D Portable Push Button Lock Box Master Lock Push Button Safe Lock Keybox Waterproof Digital Key Lock Box and Key. The Master Lock No. 5422D Portable Push Button Lock Box features a 3 1 8in (79mm) wide metal body for durability. The shackle design offers over the door mounting for convenience. Set your own 4 character combination for keyless convenience and increased security. The protective weather cover prevents freezing and jamming; and molded bumper and vinyl coated shackle prevent scratching. The Limited Lifetime Warranty provides peace of mind from a brand you can trust. Features: Over the door knob design for portable installation Convenient push button locking mechanism in familiar alpha numeric telephone keypad format Set your own combination using up to 12 letters, numbers, or both Protective weather cover prevents freezing and jamming Molded body and vinyl coated shackle prevent scratching