The TEFL Model of Wireless Resistive Temperature Sensor, manufactured by Produal Oy, is designed for detecting temperature of indoor spaces application. It has a wireless room sensors that work in 868.30 M Hz range, and is powered by lithium battery. The measurement readings is transmitted on change, or at least every hour.
Moreover, this device is provided with TEFL sensor which is constructed at the commisioning stage, and has an available FLSER configuration device to generate more efficiently.