Barking Control and Behavior Trainer: This barking control device is a 2-in-1 pet training and anti-barking device. It emits an ultrasonic alarm to stop dogs from barking or other dogs from approaching. This anti-bark ultrasonic device can be used for daily training such as B. training a dog to control its barking tendencies and other bad habits3-Level Ultrasonic Frequency: Ultrasonic dog tracker allows 3-level ultrasonic frequency for different training purposes, fixed/variable/irregular. The level of the ultrasound can be easily adjusted by pressing a button, and the indicator light turns red when the ultrasound is emitted. Ultrasound has a range of up to about 10 meters.10m range: 20 days for daily use. Charging takes 2 hours. The LED display shows when the battery needs to be charged.COMPACT SIZE AND EASY TO USE: Thanks to its sturdy construction and compact size, this portable dog bark device fits easily in your pocket and fits comfortably in your hand. Simple button operation. The anti-bark device is suitable for dogs from 6 months to 8 years old, and improper operation can render the product unusable.