I recently purchased a GWS Be Found plane finder. It lets off a hideously high pitch and loud noise when the RX and TX either lose signal to each other, or if the flight pack battery falls below 4.2 (I think its 4.2) volts.

Anyone else used them? I had a hunt through the site trying to find info on the forums, but was unable to locate any info.

Also bought a Hobbico VoltWatch 2. This pretty much just displays the current flight pack voltage and will use this in another plane I have. These any good ?

Cheers