343e44cd_Review__PetSafe_In_Ground_Click_here
[0] Battery Or Charge Interval (average) 2-4 Months [Dogtra Gold 3000 Click here] 3 Weeks [Dogtek EF-4000 Click here] 3-4 Months Every Two Months [PetSafe In-Ground Click here] 
3 Months
Review
PetSafe In-Ground Click here