Looking for a battery-free wirefree transmitter? Or a battery powered transmitter drawing ultra-small units of power? The PTM 330 gives you both. This compact low-power ISM-band transmitter module works in collaboration with the ECO 200 energy harvester. It sends an RF ‘telegram’ along with a 32-bit module ID and the polarity of the supply voltage every time a short energy pulse is supplied to the PTM 330 module. That’s as well as sending a status update of the four digital inputs.