Best Fence Shocks

The COVONO EF851 is a new generation pet contaiment system that use GPS positioning technology,it is more accurate and stable than the traditional wireless dog fence that use radio-frequency technology,designed to keep your dogs secure in an adjustable area.Why choose it?The EF851 perfectly solves the inherent defects of the traditional electric fence-unstable signal and inaccurate distance control.Due to the wide coverage and accuracy of the GPS signal,the EF851 is difficult to be interfered by metal and obstacles,it means your dogs are hard to be mistakenly warned and injured.Features:--Adjustable radius from 20 meters(22Yd) to 800 meters(875Yd)--Covers an circular area from 0.3 acre to 496 acres--Rechargeable and waterproof collar with beep/shock--5 levels of static correction to match dogs with different sensitivity--A full stimulation lasts 20 seconds at a time--The stimulation was limited to 3 times to prevent overstimulation--All functions are integrated in the collar,easy to carry and use--Low battery indicator is available--For dogs from 15 pounds to 120 pounds--90-day return period and lifetime warrantyHow it works?1.You need to identify a central point that will be the center of the play area of your dogs.2.Take the system to the central point and turn it on,then set the radius of the play area and position the system.3.After positioning,put it on your dog.4.When your dog get to the boundary line,it will beep and shock your dog,then your dog will be back.Please Note:1.Train your dog for about 3 weeks to let him know how the system work.2.Every time you turn on the system,you need to reposition it.3.Do not use this on aggressive dogs and don't use it on dogs for over 12 hours.4.We don't recommend using it on rainy days/near tall buildings due to the weak GPS signals.