Electronic dog fence, wireless dog fence system, dog training collar Expandable to 2 dogs(optional) 1.Patented design 2.10 levels of signal detective width with to the boundary 3.4 levels of proportional stimulus warning.The closer to the boundary,the more intensity of static and the quicker of the audible tone. 4.Audible and visual wire break and short indication should the wire was broken,a loud sonic alarm will sound accompanied by a flashing light 5.fully waterproof and rechargeable receiver collar