This sump pump comes with an alarm that is pre-mounted and made to provide a warning whenever the SumpJet is activated. As it does not use any electricity to operate, this sump pump is the ideal choice in an emergency situation where power is inaccessible. It is not meant to be used as your primary sump pump, only as a back-up. It is fully automatic uses the community water supply as a means to evacuate the water from the sump. For every 1 gallon of water used, 2 gallons are removed.