Features SkyShepherd Halo Invisible Fence SpotOn
$1000 $599 $1325 $999
None $9.99 $8.25 $9.95
N/A One per dog One per dog One per dog
2.75" x 1.62"   12.1"x 1.58" 11.42" x 3.62"   14"x 1.71"
2.9 oz 24.32 ox 44.48 oz 25.12 oz