On-site interception or technical listening refers to listening, recording and other processing with a technical device, procedure or program, of a discussion or a message of the suspect in order to find out the conduct of the suspect. The conversation is not intended to be revealed to third parties and the listener does not in person participate in the conversation. Technical observation refers to observation, or recording, the suspect in an offence or of premises or another place with a camera or similar technical device, procedure or program installed in such place. It may not be directed at a premise used as permanent residence. Technical monitoring refers to the monitoring of movement of an object, substance or property with use of a radio transmitter or other similar technical device. Extended surveillance refers to long term covert observation of a certain person for the purpose of the collection of intelligence. Extended surveillance may not be directed at premises used as a permanent residence.