Typically saves 60% on water charges and pays for itself within three months. Standard Features include; Occupancy detection, Battery operated, Small and discreet, variable fill and flush settings. Complete with Controller, Battery and Solenoid Valve. Hydrocell Ultra additional features; Fail safe closed operation, Low battery indication, Ambient thermo flush adjuster, Intelligent Flushing option (defaults to most economic setting and increases flushing when required by counting users). Good for sporadically busy areas. 6v Lithium Battery supplied.