An SRT division unit for performing a novel SRT division algorithm is presented. The system comprises a set of oligonucleotides which may hybridize to each other in specific ways and is able to generate a signal based on the specific hybridization events. This means that the wireless link and the IP layer are not secured until after the L3 authorisation has completed and therefore the first IP messages that trigger authorisation are sent insecurely. The front and rear section of the band saw are disposed on opposite sides of a polymeric field case. Also disclosed is a lacrosse stick comprising: an elongated shaft having a butt end and a head end, and a port formed through the head end; and a head attachable to the shaft. These polarisation means can be a follower-mounted operational transconductance amplifier, whose impedance value is sufficiently high so as not to damage the transconductance of the active branch for generating an oscillation in the quartz.