The collar works well. After giving the first in my dog, just using the beep is enough to make it run more home. Only problem found in collar is that sometimes the two stop working until raft for charge (if one is discharged the other does not work) Is very easy handling. Still not tested really works up to 800m distance, but takes up 2 blocks home. The source (Charger) has 2 pins to charge 2 devices at the same time and is 5.2V in 500mA.
