Better: PIN Codes are built in.

ALPHA has PINs enabled by default. Astro PINs are not on by default. The TRACK CODE is a 5-digit PIN number so other handhelds can track your dog. The TRAIN CODE is a 5-digit PIN number that allows other handhelds to track AND stim. Unlike the Astro, the Garmin ALPHA has the PIN CODE feature built-in -- mainly because of the STIM option. With the ALPHA, you cannot track a dog just by knowing (or guessing) the ID CODE. On the ALPHA, you must have either the collars TRACK CODE (track on handheld only) or TRAIN CODE (track and train on handheld) to see the dog on a different handheld.

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