... Tighten Friendly Dog Collar 2.functions:Tighten,Vibration,Voice. 3.World's First.It ours patent. 4.No harm ... collar (receiver for short) worn around the dog’s neck, the master can effectively control the aggressive ... order (SOS Morse Mode), to regulate the dog’s instant behaviors. After being trained by the product, ... .Tips: Though the product can stop the dog’s bad behaviors at once, you need to spend ...