The INFPIR is a wireless PIR sensor designed for use with the infinite alarm system. The detector implements a feature to combat the problem of multiple transmissions, which drastically reduce the life of the batteries. After a transmission is made, the INF-PIR initiates a four-minute delay during which transmissions will not be sent.
Features

• 15m x 15m/50' x 50' coverage
• Lithium battery powered with very low current consumption (6µA standby)
• Adaptive temperature compensation
• Selectable pulse count and LED indicator
• Superior RFI/EMI immunity
• Dual randomised transmission
• Rear tamper facility

More details online:

• You can expand this system, to have more functions and to be more suitable for other needs(detecting smoke, medical panic button for an older person). You can also connect your phone system to communicate whether an intruder came in or your elderly relative is in need of help.
• Monitoring the system - either personal or professional monitoring, or adding the home automation option;
• Read more about the Motion Detector - PIR - Infinite Prime on the Infinite Prime Wireless Alarms Presentation website
• Easy Installation and Programming guide to the Infinite Prime Wireless alarm - download the pdf file or read the manual online.