The compact size and silent vibration
alert enables you to conceal it on your body for private sweeping of
wireless listening and video transmissions. The JM-20 PRO, with
it's 5 section bar graph to detect proximity of transmitters, has also proven
itself as a quality professional sweep unit. It's sturdy and durable metal case
assures years of service. Powered by a rechargeable NiCad battery, unit comes
complete with battery charger and earphone.