IQ Mini sensors are S-Line encrypted sensors operating on the 319.5MHz spectrum. They have an operating range of around 600 ft open air. The battery life on this particular sensor is 8 years but varies by use.
The PowerG sensors operate at 900 MHz frequency and use 128-bit AES encryption. They offer Multichannel, Frequency Hopping Spread Spectrum technology which allows the transmission to hop between wireless frequency channels, allowing for enhanced encryption. They also have a much farther operating range of 2000 ft or so open air. Battery life on the PG9303 is about 6 years under normal use.