The SA 104-1 docking station supports simultaneous battery charging and data download from SV 104IS noise dosimeter . The instrument is positioned on the docking station with a holders system that ensures the correct position for battery charging. The SA 104-5 uses the mini USB port for battery charging and connection with PC. The data download is handled by the infra-red interface. The status of the dosimeter battery is indicated by the LED diode located next to the handle system.