The Chillon is ideal if you are looking for a large crevice-style bat box that can accommodate small colonies. The capacity of this particular box is 35 mm deep which is suitable for 15 pipistrelles.
 
Key Features:
Woodstone box: insulated and maintains an even temperature
Painted black: holds the heat
Wooden backplate for attachment
85 mm long textured landing board
Textured interior to aid bat movement
20 mm entrance slot 
 
Specifications:
Weight - 4.7kg
Height - 44.0cm
Width - 29.0cm
Depth - 0 9.0cm
Material -  Woodstone