Do you have trouble with the control of your dog? Don't wait. Begin from today to use 7 methods (combination of vibration, ultrasonic and shock) at 9 intensity levels, to train your dog effectively and effieciently. Besides, you can use these features in remote control mode and automatic anti-bark. Pet owners have used this collar to eliminate nuisance barking, curb aggressive behaviour to humans or other dogs, establish territorial boundaries in your home or outside, train dogs to walk correctly with or without a leash, and potty train their dogs to use the outdoors. This is a dog training system for TWO dogs. Check our listings for the same model for ONE dog. Other Features · Remote working distance: 600 yard (550 m) under ideal condition. · Two pairs of prongs (long/short) to suit dogs with different thickness of hair · Continuous Correction feature (Ultronsound, Vibrate or Shock button will not stop as long as press down those three buttons) and thereby prevents false triggering · Recommended for dogs heavier than 15 lbs Package Included 1 Remote transmitter 2 Receiver unit with built-in rechargeable battery 1 A/C charger 2 Dog collar straps adjustable from 6" to 24" 1 Instructions including tips on training Refund & Warranty: Refund must be requested within 14 days upon receipt. For refund, the items must be received in their original and unused condition, with all accessories and packaging included. Lightly used item may be refunded but 20% restocking fee will apply. Each purchase comes with a limited 1-year warranty that covers manufacturer defects and malfunction under normal conditions. Buyer is responsible for the shipping fee of returned item. After 60 days, we will charge $9.99 return shipping fee for service within warranty period.