Wireless M-Bus AMR range, an Ambient Temperature sensor, uses a Wireless M-Bus protocol for radio transmission of room temperature. Equipped with LCD screen it covers a range up to 300m. This ready-to-use room temperature transmitter allows the integration of the Sensor into an architecture of consumption data collection. It displays real time temperature allowing discrete integration, even in individual units. A 11-year autonomy guaranteed with a lithium battery with a period 4 minutes of sending measurement and 2 minutes for refreshing display. A remote sensor version which allows two measured temperatures (internal and external probe) to be displayed and sent simultaneously is also available . Protection of radio emission data by AES128 encryption is compliant with the OMS standard and fully compatible with EN 13757-4: 2005 standard.