Piezoelectric seismic sensor for surface with low absorption, it's compatible with the radio system BiTech (connectable to the auxiliary input of the BT-CME / CMW devices). This small sensor (18x18x10mm) does not need to be powered; when it is in alarm it opens the circuit for a time ranging from 2 to 30 sec. based on the received stress. Coverage area is 2m of glass. It comes complete with cable (2-pole, 2m). Installation with adhesive. Material ABS, color brown.