The Classic In-Ground Fence Receiver Collarhas 8 levels of correction. Level 1 is a tone and vibration setting which is great to use when youre training your dog on their new in-ground fence boundary. Receiver collars with a vibration setting are also great forpetswho are hard of hearing so they can safely enjoy playing outside too. Levels 2-8 are adjustable static correction settings which you can set based on your dogs temperament. Purchase a receiver collar for every pet in your family so they all can safely play off-leash together. You can add as many collars as you want to your compatible Classic In-Ground Fence.This receiver collar is also compatible with all ourPawzAway Pet Barriers, so his collar can keep him safe when hes playing in the backyard andaway from off-limits areas.Your pet deserves the best.TrustPetSafeto keep your pet healthy,safeand happy.