Chamberlain PIRV-400R Additional Sensor For Reporter Wireless Alert System With 2-Way Voice Communication - Alert sounds when heat or motion is detected by passive IR sensor - Advanced passive IR sensor distinguishes between vehicles, humans and animals - Expandable up to 8 remote sensors - Compatible with alert system (RWV-400R) (sold separately) - Requires 4 AA batteries (not included) - Includes mounting hardware - Part No. PIRV-400R or PIRV400R
