The H2Q ERCU wireless control unit is used when there is no provision for attaching a level sensor in the cistern up to the ERCU ONE, SILENT PLUS or PRO PLUS systems. Wireless connection between level sensor and ERCU unit with a range of 200m. The control unit is equipped with a water-resistant housing, requires no calibration and is maintenance-free. A long life with only 2 AA batteries. Not for use with CONNECT versions. Metal covers and concrete walls can reduce the range of the ERCU wireless control unit.