Sensor: Stations are equipped with a 3-component Reftek sensor (151-60), here covered by a polystyrene box. (© IMGW)

Digitizer: Stations are equipped with a Reftek 130 digitizer. (© IMGW)

GPS: A close view of one installed GPS antenna. (© IMGW)

GSM antenna: Here the GSM and GPS are installed together. (© IMGW)

Seismobox: The digitizer, together with a backup battery, and a modem for the data-transmission are kept in this rigid plastic box for safety. (© IMGW)