Suggested training steps: When a dog is misbehaving: 1. Use the Beep mode to alert the dog with a tone. 2.If the dog doesn't respond, use vibrate mode. 3. Vibration mode can have a good training effect on some dogs and stop their bad behavior. If the dog does not respond to the vibrations, use the electric shock mode for a short time (the intensity is adjustable, which is completely harmless to the dog). After the dog has received the various training alerts, it can stop its bad behavior whenever it hears the alert sound. In general, you no longer need to switch to vibration or electric shock mode. Professional 2 Dog Training Collar If you have two dogs and need two receivers, you can buy this product and sync it with the remote control. Once synced, you can control both collars (two dogs) with one remote control. The remote control has two channels. You can synchronize the two receivers on the two different channels (channel 1 and 2) and train your dogs separately. For example, if