RKI RI-600 Indoor Stand Alone CO2 Monitor is an indoor monitor that detects Carbon Dioxide in the air with five different ranges including PPM and % volume. It has a sleek user-friendly design and easy to operate. The RI-600 has two preset alarms, and comes ready to operate with a simple wall mount bracket and 10 foot power cord. If a high level of CO2 is present, the user is notified by an audible alarm tone and the multicolored LCD digital display.