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 key-less 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
• Large buttons for ease of use, even in low light conditions
• Large internal cavity and removable key hook prevents jamming
• Protective weather cover prevents freezing and jamming
• Molded body and vinyl coated shackle prevent scratching
• Also available with personalized laser engraving 
  
• Internal Dimensions: 3-1/2in (89mm) H x 2-1/4in (57mm) W x 1in (25mm) D