4.Jamming range: up to300m, the jamming radius still depends on the strength signal in given area; 5.Built-in directional panel antennas , all the tx frequency covered down link only; 6.Power supply: 50 to 60hz, 100 to 240v ac ; 7.With ac adapter (ac100-240v-dc27v); 8.Mension:520(l) x 230(w) x 250mm(h); 9.Full set weight: about 22kg(used of built-in directional antennas) ; Application area: It can be applied at meeting rooms, prison, museums, training centers, factories and more For some locations of special purpose such as hospitals, gas stations and more, please do field test first to make sure no interference happened to the normal operation of their equipment and instrument; Warranty: one year from delivery date; We can do customize frequency according to you request, please email us.