Measuring range:dos rate 0.01 u Sv h~150mSv h The cumulative dose:0 u Sv~999.99 mSv The energy range:40Kev~3.0 Mev Energy response error:+-30%(relative to 137Cs) Protection alarm response time:1~2 seconds(the most fast) Power supply:use a AAA battery Shape size:110*68*21mm Weight:70g Product Name:dosimeter