IoTree is a spin-off from the University of Liege (Belgium). IoTree develops, produces and sales wireless sensors for IoT applications. The sensor is wireless and energy efficient. The ‘batteryless’ sensor harvests energy available in the surroundings (light, motion, heat, …). Likewise, the ‘less battery’ sensor is powered by a tiny battery providing an extended autonomy. Heterogeneous quantities, collected by the wireless sensors network, are transmitted in real time to the Cloud.