Able to connect to PC with USB and insert SD card,one years data memory * Recording and downloading noise data (can be saved in Excel and txt format) * Conformed to the IEC651 Type2 and ANSIS1.4 Type2 standards * OVERe and UNDER symbol appared when the reading is over the upper limit and under the lower limit * With tripod mounting screw at the back for fixing on tripod during field works