Since 1991, PetSafe has been designing and manufacturing innovative electronic and non-electronic pet training products. Gently discourage excessive barking with the PetSafe Big Dog Rechargeable Bark Collar, each time your dog barks, he feels a safe, gentle static correction. The correction reminds your dog to stop barking. The PetSafe Big Dog Rechargeable Bark Collar has three training modes: Temperament mode (vorrection increases until barking stops and the last correction level becomes the new starting level), Progressive Correction mode (correction increases until barking stops, then resets to the lowest level) and User-Selected Correction mode. The PetSafe Big Dog Rechargeable Bark Collar has an automatic safety shut-off: correction stops after 80 seconds.PetSafe Big Dog Rechargeable Bark Control Dog Collar