Unison Aero products originally shipped with a 315Mhz radio frequency. This was changed to 902MHz around October 2014. Every Aero product has an FCC label saying whether it is 315MHz or 902MHz. Products in one frequency cannot communicate directly with products in the other frequency.
Unison Aero was discontinued and replaced with Echoflex in 2016, which still uses 902MHz radios. Echoflex products can communicate and work with Aero products that are also 902MHz.