The ACW-TM1D allows you to send temperature information collected with a digital sensor. This transmission is done on regular basis and by threshold alert, in case of a problem, an email or an sms alert will be sent (this service is an extra).
Also available with two temperature probes ACW-TM2D
Frequency: 868 MHz
Battery: 3.6V AA Lithium
Price: on MyFactory, €225