The Tecnotronic is an automatic on / off switch with water sensor, which automatically switches the pump on when the water requirement is reached and switches it off again when the water requirement stops or when the water level is too low. This protects the pump against dry running. Specifications Hozelock Tecnotronic The Tecnotronic contains an internal non-return valve that prevents the water from running back and maintains the pressure in the pump. The indicator lights on the Tecnotronic show the operation of the pump and the function being performed.