“keeps other pets outsidewith collar magnet for access permissiontransparent flap, silent actionwith special sealing and magnetic lockincl. tunnel elementdepth 10–35 mmcan be extended with more tunnel elementstotal measurements 21.1 × 24.4 cmcut out size 16.5 × 21.6 cmflap size 14.7 × 15.8 cmbattery-operated (9 V battery not included)”