For cats. plastic, keeps foreign pets outside, with collar magnet, to be attached to the collar, transparent flap, silent action, with special sealing and magnetic lock, with safety lock, incl. tunnel element, depth 10–35 mm, can be extended with tunnel elements, total measurements 21.1 × 24.4 cm, cut out size 16.5 × 21.6 cm, flap size 14.7 × 15.8 cm, battery-operated (9 V battery not included), 3 years guarantee.