Delta SE is the straightforward remote trainer in Garmin’s dog range: a slim handheld transmitter and a collar-mounted dog device working over a 27 MHz link at a stated half-mile range. There is no GPS tracking here — it is a training system, and it is priced and sized accordingly.
The handheld weighs 3 ounces and is rated to more than 70 hours per charge; the dog device is 2.5 ounces and rated to about 60. Both are IPX7 and both charge over USB-C, so one cable covers the pair.
Buy the bundle to get both halves. The handheld-only and collar-only options are there to add a second dog to an existing setup or to replace one half of a system you already own.
