What this signal meter can offer you is that it can be used at night because of its blue back light.What this signal meter can offer you is that it can help you to find the best position for antenna installation.It is made of plastic, which is durable.The length of the product is 13cm, the width is 6.5cm, and the height is 2.7cm.It can help you to find the best position for DVB-T antenna installation.Item Name: Digital Satellite FinderMaterial:PlasticSize:White: 12.8cmx8.2cmx5cm/5.04inx3.23inx1.97inBlue: 11cmx6cmx6cm/4.33inx2.36inx2.36inNotes:Due to the light and screen setting difference, the item's color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:1 X User's Manual1 X Digital Satellite Finder