How It Works

The Pet Dream Automatic Pet Door and Tattoo Pen works by having the
 Tattoo Pen apply a tattoo using a magnetic metallic pigment suspended
in a liquid ink that stays in the skin of your pet's ear.
The metallic pigment is detected by the "Pet Dream Automatic Pet Door" metallic sensor,
when the pet comes near the sensor. This triggers the pet door to unlock.

tattoopen bustertattoo doghouse