PKI 4190 is a state-of-the-art Non-Linear Junction Detector for the detection of hidden electronic devices. For locating mainly listening devices, wired, wireless and on/off devices. This is particularly the case in walls, floors, ceilings, fixtures, etc. The digital signal processing increases the sensitivity and amplification and conducts up to 18dB higher detection sensitivity. The integrated frequency hopping method provides the best result when using several transmission frequencies over a wide operating band. The power control of PKI 4190 can be manual or automatic, from 30mW to 3W. Frequency stability is ensured by the integrated synthesizer receiver. For the detection of various electronic components, PKI 4190 offers 3 different operating modes, such as continuous wave operation, pulsating operation and frequency hopping. PKI 4190 may only be used by authorities, persons and organizations that are not restricted by the US FCC regulations.