The SHSUXXXX line are bus-powered room sensors for wall-mounting. They are available in different combinations of CO2, temperature and relative humidity. The only connection needed for the sensor is the Dupline® 2-wire cable. Several sensors can be multi-dropped via the same Dupline® 2-wire bus, thereby simplifying the wiring to the controller significantly.
Carlo Gavazzi CO2/T/%RH sensor SHSUCOTH