Suction device, in particular vacuum cleaner or dust extraction system, comprising - a collection container adapted to receive dust, dirt and small particles, - a vacuum generating device for generating a low pressure (p v) in the collection container, which is lower than the ambient pressure (p 0), - a suction opening in the collection container, - a suction hose with its first end connected to the suction opening and its opposite second end connectable to an air outlet of a hand-held electric or pneumatic power tool, - a filter element which is arranged between the collection container and the vacuum generating device in an air flow generated by the vacuum generating device and which is adapted to filter dust, dirt and small particles out of the air flow, - a control device adapted to control the vacuum generating device in order to change an operating status of the vacuum generating device depending on an operating status of the hand-held electric or pneumatic power tool to whose air outlet the second end of the suction hose is connected and optionally taking into account further parameters, - a radio receiver for receiving radio signals, the radio receiver being in operative connection with the control device, and - a communication device located at or near the second end of the suction hose and comprising: - a sensor element for detecting a current operation status of the hand-held electric or pneumatic power tool and for outputting a sensor signal depending on the detected operating status of the power tool, - a radio transmitter for transmitting a radio signal, and - a processing device which is in operative connection with the sensor element on the one hand and with the radio transmitter on the other hand and which is adapted to cause the radio transmitter to emit a radio signal depending on a sensor signal received from the sensor element and optionally taking into account further parameters, characterised in that the communication device and the radio receiver are designed to realise only unidirectional communication from the radio transmitter of the communication device to the radio receiver of the suction device. - a collection container adapted to receive dust, dirt and small particles, - a vacuum generating device for generating a low pressure (p v) in the collection container, which is lower than the ambient pressure (p 0), - a suction opening in the collection container, - a suction hose with its first end connected to the suction opening and its opposite second end connectable to an air outlet of a hand-held electric or pneumatic power tool, - a filter element which is arranged between the collection container and the vacuum generating device in an air flow generated by the vacuum generating device and which is adapted to filter dust, dirt and small particles out of the air flow, - a control device adapted to control the vacuum generating device in order to change an operating status of the vacuum generating device depending on an operating status of the hand-held electric or pneumatic power tool to whose air outlet the second end of the suction hose is connected and optionally taking into account further parameters, - a radio receiver for receiving radio signals, the radio receiver being in operative connection with the control device, and - a communication device located at or near the second end of the suction hose and comprising: - a sensor element for detecting a current operation status of the hand-held electric or pneumatic power tool and for outputting a sensor signal depending on the detected operating status of the power tool, - a radio transmitter for transmitting a radio signal, and - a processing device which is in operative connection with the sensor element on the one hand and with the radio transmitter on the other hand and which is adapted to cause the radio transmitter to emit a radio signal depending on a sensor signal received from the sensor element and optionally taking into account further parameters, characterised in that the communication device and the radio receiver are designed to realise only unidirectional communication from the radio transmitter of the communication device to the radio receiver of the suction device. - a sensor element for detecting a current operation status of the hand-held electric or pneumatic power tool and for outputting a sensor signal depending on the detected operating status of the power tool, - a radio transmitter for transmitting a radio signal, and - a processing device which is in operative connection with the sensor element on the one hand and with the radio transmitter on the other hand and which is adapted to cause the radio transmitter to emit a radio signal depending on a sensor signal received from the sensor element and optionally taking into account further parameters, characterised in that the communication device and the radio receiver are designed to realise only unidirectional communication from the radio transmitter of the communication device to the radio receiver of the suction device.