There's some technical and licensing information at FCCID.io, which appears to be a non-official compilation of wireless device applications filed with the FCC.

In the US, the device operates on a shared, secondary basis (on a frequency that happens to be within the 33 cm Amateur Radio band, around 902 MHz), with a maximum effective radiated power of 3.1 watts.

As a Part 90 device, it must tolerate (i.e., users can't complain about) interference from industrial, scientific, and medical devices. It is also forbidden to cause interference to the Federal Government Radiolocation Service, which is the primary user of the band.

In Europe, it operates at 867 MHz. The frequency was chosen to optimize effectiveness of reaching the reflector under snow.

Use is limited by the FCC to ski resorts and other areas of high potential for avalanches. Use is limited to actual emergencies involving threats to safety of life, and necessary training related to such operations.

So for various reasons, both technical and legal, this doesn't appear to be designed for general-purpose SAR use. It's really just for finding people in avalanches.