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NiMH batteries only provide 1.2V per cell whereas Alkaline batteries provide 1.5V (nominal values). This means that new/fully charged batteries will provide a total of 9V for Alkaline and 7.2V for NiMH. The EV3 is programmed to show low battery somewhere around 6.2V and turn itself off around 5.5V. There is no option a available to tell the EV3 the ...
This is part # bb42 : Electric, Light & Sound Siren 4 x 2 x 4 Jack Stone and here you can hear the sound it is from Set 4621-1: Red Flash Station don't know if the battery is replaceable
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