The Helensson ITM2 is a stereo dual zone, internal, side mounted trigger is designed to work with all drum modules and systems.  This internal trigger works great with all mesh heads, and onboard controls allow accurate tracking of mylar heads as well. The ITM2 is the Perfect A2E Trigger Solution!The module incorporates two independent variable potentiometers for sensitivity adjustment of both the head and rim piezos.  By adjusting these parameters, a unique head to rim combination can be fine-tuned to provide a perfect sensor balance to your module or interface. In addition the sensitivity controls, a phase switch is located on the ITM2 to change the polarity of the head piezo. This type of configuration is needed for Roland drum brains and some other applications. The phase switch and pots make all A2E conversions quick and easy.  Installation of the Helensson ITM2 module is simple and requires only a screwdriver.  With a steel casing being a mere 2 1/2" tall... the Helensson  trigger module is small enough fit even super-shallow piccolo shells.solid steel shell with powder coat finishsimple to install - one lug screwsmall 3 1/4" w/foam - the smallest internal in the industrydual piezo / zone configurationindependent head and rim sensitivity adjustmentsphase / polarity switch for head sensorfrequency tuned head piezosingle 1/4" female TRS jack for dual outputs                                - another fine product from helensson.com  -