TEGnology ApS is opening new doorways to self-powered IoT sensors. Industry 4.0 requests optimization of energy consumption by controlling operational processes. Smart control needs smart monitoring. The goodness of monitoring depends on the coverage and sampling rate, which are usually constrained by the power supply of sensors. Future Internet-of-Things (IoT) sensors cannot run on cables or batteries. TEGnology brings an enabling technology with self-powered sensor system, which is truly wireless and battery-free. With the newly developed generator, TEGnology's sensor unit converts temperature difference into electricity for powering sensor nodes as well as wireless transmitters. Signals are then communicated in a preferred wireless network. We hold the key to high volume manufacturing of thermoelectric generators with abundant and environmentally-friendly materials, which can be mass produced.