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High-sensitivity contact monitor system for audio listening through walls windows doors etc with unique audio transmitter built-in for wireless monitoring and selectable noise filter. The unit comes complete with a surface microphone and needle microphone for insertion into small holes and crevices for optimum clarity. The KWL-3000 can transmit all audio from its microphones to a remote receiver (supplied separately) so you can remotely record or listen to the transmitted audio. There is an audio recorder socket also, so you can connect a recorder via the 3.5mm jack socket.