Astro 320 Dog Alert OptionsA new option for Dog Alerts is Vibration. The Astro 320 includes a vibration motor. This allows you to pick from alerts that are tone only, vibration only or both tone and vibration. This can be a handy feature especially in the winter if you are wearing gloves or thick clothes. You have the option of having different alerts for point, treed, lost
communication and lost GPS signal.