Measuring changes in activity and sleep over time is important for research and practice. While commercially available home monitoring systems passively track these parameters, the feasibility, acceptability, and usefulness of new products need to be evaluated. We tested a commercially available system for providing long-term data on activity and sleep with 10 single women (mean age, 86.5 years) who were monitored in their homes. Motion detectors, a bed sensor, door sensor, and chair sensor were installed for 3 months to collect data. Other measures, objective actigraphy data from 1 week and self-report, provided data for comparison. Sleep and activity data were similar across measures; the most active participant had the highest scores on all activity measures including sensor data. Participants were generally positive about the monitoring system, but participants varied in their awareness levels of the presence of the equipment. Use of the sensor system was feasible in this pilot study and acceptable to participants. The study also illustrates challenges researchers can encounter when working with a commercial company.