Features:19mm entrance slot is ideal for bats but deters birds.Close fitting panels and fixed roof (precision cut by computer controlled equipment) for a draught free interior and improved heat retention.Internal ceramic heat sink for improved temperature stability.Easy and safe to erect box on walls or trees - relatively light weight, with 1 keyhole mounting hole and 2 extra screw holes for secure fixing.Floor slides out (after removing 1 screw) for cleaning or inspection where permittedExternal surfaces treated with water based non-toxic non-volatile wood treatment.Manufactured in exterior grade exterior grade plywoodBat box designed for British cavity roosting bats including brown long-eared bats and Myotis species.External surfaces black to increase heat absorption.Internal ceramic heat sinks to retain and stabilise box temperature.Grooved landing ladder continues internally.Precision cut panels for dry, draught free, long-lasting box.Roof has internal grooves to make it easy for bats to hang and cluster.Specifications:Materials: Exterior Grade Plywood with ceramic insertsConstruction: Panels stapled together with surface sunk staples.Finish: External surfaces treated with water-based non-toxic non-volatile wood treatment, with active constituent natural borate mineral salt.Single contiguous space with close fitting roof, grooves in roof to facilitate bats hanging and clustering. Ceramic inserts front and back.Entrance: 19mm wide slot.Access: Floor slides out completely and is secured with one screw.Fixing: Concealed keyhole at top of box, with 2 additional holes at bottom corners of back panel.Dimensions and WeightDimensions: Overall height: 38cm, Overall width: 24cm, Overall Depth: 15cm.1.5kg.