FS - Innotek model HF-25W "invisible fence" system. Digital signal, collar with replaceable 6-volt battery. New in box, all materials and paperwork included. Covers up to 5 acres with 500' of boundary wire included. The box says it is for all dogs, but the website suggests this one is best for dogs under 60lbs. Paid $160 a year ago, selling for $100 negotiable, plus shipping. Selling because my Boston Terrier decided jumping the fence just isn't all it's cracked up to be, and now stays in the yard. Additional specs (from the website) HF-25W Information This easy-to-install in-ground fencing system provides superior performance over all other replaceable-battery systems on the market. A great alternative to above ground fencing, and it is economical. It is ideal for yards from 1/4 to 5 acres in size. Its lightweight, 2.5 oz. The water resistant collar receiver can be used with dogs as small as five pounds and operates on a 6-volt alkaline battery (included). The underground containment system has OmniDirectional signal to help prevent run through. It also has Dual Zone Boundary reinforcement, providing higher stimulation levels as your dog gets closer to the boundary. This Innotek system also features built-in lightning protection for you and your dog. Containment Features - Proudly Made in the USA! Pure Digital Signal: Eliminates interference from stray signals. Computer aided electronics allows for smooth and consistent operation. Our micro processor works twice as hard as others and takes less signal to activate correctly. The NEW Sensitive approach to pet containment systems mean's a more accurate correction point. Most Humane System: Innoteks computer aided electronics continues to offer the most advanced and most humane systems available. All Innotek systems monitor your dogs position and speed from the buried wire. Ask millions of satisified users. Progressive Correction: (Run Thru Prevention) All Innotek systems offer progressive correction, and ONLY Innotek systems, because it is a US Patent. If it isnt Innotek its not Run Thru Prevention. If it isnt Run Thru Prevention it is not the best system available in the US. Water-Resistant Collar: This is a true water-resistant collar. Great for rain, snow and everyday wet conditions. Anti Drain: Another long time feature developed by Innotek. Anti Drain prevents a dog from lingering in the warning zone area. Constant Alert Operation: Unlike other systems where the system goes to sleep, this system is always working to protect your pet. Sleeping units like alarm clocks may not always turn on. The advanced battery system does not need to shut off to conserve a charge. Auto Safety Shut Off: Like most other system for years Innotek has pioneered and offered Auto- Safety Shut off to prevent unnecessary long exposure to a corrective stimulation. After shut off the unit will reactivate automatically. Innotek has always lead the way in Safety. Line Break Indicator: A simple feature to alert you of a line break, should it occur. Line breakage is most often a result of using inferior non burial approved wire. Innotek is the only manufacturer to offer burial approved wire. Built-in lightning protection: Protects your home from power surges caused by lightening strikes. Omni-Directional Signal: A must for all containment systems as it eliminates all dead signal areas. This prevents your pet from finding a way out. A must for any system. Operates Multiple Collars: This system was designed to operate as many collars and contain as many dogs as you desire. Adjustable Correction Zone: Innotek pioneered the adjustable boundary, allowing you to set the correction field from a few feet all the way up to 20 feet. A system must fit in a yard. Precision Early Warning Tone: To alert your pet and aid in the safe training of your pet. Video and manual: Complete Installation and Pet Training Instructions.