Radio supervised temperature detector, compatible with PowerMaster systems. Detects extreme cold, freezer failure and extreme heat. Provides up to four selectable temperature alert points. Provides visual notifications when the alarm goes off. Compatible with PowerMaster systems and PowerG receivers. PowerG bidirectional radio technology. Visible indication of signal quality on the device. Autotest and manual test button included. Additional probe allows monitoring of refrigerator, freezer and outdoor temperatures. It employs advanced AES-128 encryption algorithm for message identification. Frequency Hopping- Spread Spectrum and TDMA technology provide robustness and reliability similar to wired systems. Visible low battery indication. Battery life, 7 years with normal use. Dimensions: 81 x 32 x 25 mm.