It displays the relative signal strength on its numeric display * There are two swicheable displays of signal strength, and an audible alarm which can be set to activate when the signal strength reaches a pretermined level. The 2.5mm socket on the side is for the optional TMC100 antenna.

* Frequency range 10MHz - 2GHz * Numerical display * Bargraph display 1 - 24 segments * Dynamic range 30dB min. * Signal strength bargraph * Selectable threshold audio alarm * 2.5mm jack for optional antenna * Supply 1.5V AA Alkaline battery * Size 71 x 48 x 28mm * Weight 85g