Chair Monitoring Chair-Check II Control Unit Chair Check® II Control Unit No On/Off switch 9 Volt Battery Powered Low battery Indicator Automatically arms upon detecting weight Alarm silences once weight is back on the sensormat Selectable alarms Immediate alarm once weight is taken off the sensormat Offers selectable three second delay setting for bed monitoring Uses low cost disposable pressure-sensitive mats Conforms to U.L. standard 1069 and CSA certified standard C22.2 No. 205R U.S. patented 2 year warranty Basic-Check Control Unit Basic-Check® Control Unit No On/Off switch Monitors automatically Portable can monitor anywhere bed, chair, toilet No settings or adjustments single reset button puts system on hold until weight is detected again 9 volt battery operated with a low battery alert Meets UL and CSA standards 2 year warranty Bed Control Units