Cat Mate Electromagnetic Cat Door for Wood enables entry and exit of yourcat. Because the use of batteries enables silent action of the door and nomagnetic pull on your cat's collar, more timid cats are less likely to befrightened or panic when they use it. * Self lining to 60mm thick -ideal for all doors * Silent action will not frighten pets or disturbowner * Transparent flap is preferred by most cats * draft andweatherproof brush sealed flap with magnetic closure * Rainproof seal *Easy to use 4-way lock * Approximately 12 months operation from 1xPP3/9Vbattery ( not supplied) * Includes 2 super compact cat collarmagnets Overall Size: 195mm x 242mm (H) Cut Out Size: 168mm x 219mm(H) Door opening size 150mm(w) x 155mm(h)