Honeywell IAQPoint2 User Manual page 1355

Specifications
Product Dimension Diagrams
Product Dimension Diagrams
The product main housing clips into the mounting plate provided with the
unit. The housing itself measures 9.89 x 6.34 cm, not including the
sensor "antenna". However, since it must be used with the wall mouting
plate, the drawings and dimensions below include the plate dimensions.
Assembled Product Dimensions
IAQPoint User Manual 39