The JM-20 PRO is a time proven high quality and dependable RF detection meter. Now updated to detect RF signals from 1MHz to 6GHz. New high-gain flexible antenna covers entire frequency range, no need to switch antennas and double your work to find bugging devices! No longer can the new 4.2 and 5.8 GHz transmitting devices hide form the JM-20 PRO. 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 recharger and earphone.