SANTA CRUZ CITY OFFICIALS HAVE INSTALLED ALARMS ALONG THE SAN LORENZO RIVER TO PREVENT ILLEGAL ACTIVITY. THE BOXES PRODUCE A HIGH PITCHED NOISE THAT CAUSES DISCOMFORT TO ANYONE LOITERING ALONG THE LEVEE . THE DEVICE CALLED ‘THE MOSQUITO’ HAS BEEN INSTALLED UNDER THE RIVER’S BRIDGES TO STOP ILLEGAL BEHAVIOR INCLUDING DRUG TRAFFICKING. THE NOISE BOX ALSO KEEPS AWAY PEOPLE BLOCKING PEDESTRIANS AND BIKE TRAFFIC. THE MOSQUITO CAN RUN FOR 24-HOURS STRAIGHT.