The unit is tightly enclosed for waterproofing reasons it will not be beeping loud. If you wish to hear the unit beep, take the lid off, and test the receiver against the wire. Also check to make sure the battery is good. How many dogs can I put on the system? As many as you wish, but each dog will need a separate collar. Will this unit harm my family with pace makers? Contact the manufacturer of the pacemaker, and let them know we are using a 10.65KHz signal The Sport Dog Remote Trainer is the first full featured remote training collar designed for both the professional trainer and the average pet owner with no training experience. This remote training collar is most appropriate for dogs over 15 pounds that are easy or average to train. A complete, comprehensive training manual and video shows how to properly use The Sport Dog Remote Trainer to make training a fun and rewarding experience for both the pet and the pet owner. The Sport Dog Remote Trainer can be used to deter unwanted behavior such as digging, chewing on furniture, jumping on guests, or barking. Or it can be used for basic obedience training such as teaching the "come" command. PST-100 Sport Dog 100 Yard Remote Training System

Sport Dog Remote Trainer for Stubborn Dogs The Sport Dog Remote Trainer for Stubborn Dogs is the first full featured shock collar designed for both the professional trainer and the average pet owner with no training experience. This remote training collar is most appropriate for dogs over 25 pounds that are hard to train Deluxe Little Dog Trainer If you have more than one little dog that needs remote training, you should get this trainer. With 255 factory set frequencies, you can correct each dog individually. You can also mix and match with the Big Dog Trainer Deluxe Big Dog Trainer If you have more than one big dog that needs remote training, you should get this trainer. With 255 factory set frequencies, you can correct each dog individually. You can also mix and match with the Little Dog Trainer Sport Dog Retriever/Trainer The Deluxe SportDog Retriever/Trainer is the best remote trainer/retriever ever made! Has an amazing range of up to two miles! Twenty-four stimulation levels. Specifically designed by professional retriever trainers for the exacting training of a champion retriever.