No Pain No Shock Anti Barking Device for Dogs:The prefesional dog training device with advanced ultrasonic technology which emits high-frequency sound waves that grap dogs attention when they are excessive barking,safe and effective for dogs and human.The ultrasound lets the dog know it is performing an undesired behavior, so its use is not really limited to barking. If a dog is doing something wrong, such as chewing a sofa, this device can come in very handy. This no shock dog barking deterrent train your dogs to be relaxed and trusting instead of terrified. 2X Emmiters 3 Modes Barks No More Dog Training Device: Dual super effective sonic emiters send out 3 modes sound frequency to stop defferent bad behavior; Low frequency for a warning effect, a variable frequency to graps dogs attention and in case they get used to the fix frequency, High frequency with light flash to Stop aggresive dog' bad behavior. Different modes effective for all kinds of dogs, choose the best mode for your puppy. 50 FT Bark Control Range: Our dog bark deterrent device built-in light and works up to 50 feet, making it a good option for indoor and outdoor use. The ultrasonic dog trainer and deterrents are used mostly to deter inappropriate barking, and other destructive behaviors. It good for dog owners use them to establish habits and routines with their pets; the handheld styles also for who are on walks or hikes to provide protection from strays.