Over 45 years of making the great outdoors truly great. Invisible Fence Brand Invisible Fence of Delaware Valley 66 East Oakland Avenue Doylestown PA 18901 215-345-1800 ©2018 Radio Systems Corp. All Rights Reserved. Enjoy the best Invisible Fence® Brand has to offer! On an Outdoor Containment System Offer valid on professionally installed. premium outdoor containment packages. Must present coupon at time of purchase. Not to be combined with other discounts or valid on previous purchases. Participating dealers only. Expires 10/31/18 Act now to schedule a FREE, no obligation, in-home consultation!