+x Tony N - 5/26/2022 8:08:08 AMThe SkyEcho2 (SE2) is small, lightweight, compact, needs no external power (up to 24 hrs in receive only mode before batteries need charging), uses in-built antennas and can receive ADS-B Out and FLARM equipped transmissions. For FLARM reception a small annual subscription needs to be paid to SkyDemon.The SE2 positioning is important to ensure best possible reception of signals.Hope this helps.