Generic Anti Spy Portable Wireless Radio Frequency Rf Detector (Tx Frequency: 800-1500mhz and 1800-2500mhz) Radius range(m) up to 40 meters Indicate mode: 9 levels LED luminescence indication/voicing instruction Main TX Frequency : 800-1500mHz,1800-2500MHZ Function : High sensitivity, scope adjustable, large range of detecting frequency Detecting dynamic range:70Db