Steel construction with plastic panel. Opens with a 3-8 digit code. Different coloured lights indicate when the door is open, when the battery is low and as a warning message. Includes override key and protective floor mat. Electronic Combination Opening 3-8 Digit Code Length 20mm Width Locking Bolt Tamper-Proof Mounting System Can be Bolted to the Wall Key Override Electronic Combination Opening 3-8 Digit Code Length 20mm Width Locking Bolt Tamper-Proof Mounting System Can be Bolted to the Wall Key Override