Telldus Tellstick Net / Znet is a hub for controlling smart home products. The hub uses open standards and frequencies like 433 MHz and Z-wave (depending on model) to talk to your connected devices and you can control the home anywhere in the world.
With a Tellstick connected to Tibber, you get the opportunity to connect a variety of sensors from different brands to Tibber. It gives you a better overview of your home and your home's consumption.
To connect your Tellstick to Tibber you need to connect to Telldus Live, which is Telldus's own cloud service.