Function: 1. Flashlight function: Barking control devices have independent flashlight with strong light, equipped with ultrasonic operating indicator, independent ultrasonic button function, and the actual environment can be do 10 meters. Designed with dog hearing characteristics in mind, making it easier for dogs to understand and learn. 2. Ultrasonic do bark control device: ultrasound does not affect people, ale can attract the dog's attention without hurting the dog; when the dog stops misbehavior, give him food, threats or stroke to enhance the training effect. 3. 6 colors of light: ultrasonic dog barking deterrent devices adopt 6 kinds of light colors that can be switched, it is safer to go out at night and it is equipped with power LED display, which is more convenient do viewing and can be clearly seen at night. 4. Powerful battery life: Portable barking control devices use a large battery, which ma long battery life, energy saving and durable very long standby time, which can be used for a long time, suitable do long distance travel, indoor or outdoor, without worrying about power consumption. 5. Portable: The portable design of bark control devices is suitable do indoor or outdoor use, can be used do train dogs za ultrasound or worn to guide other animals, high frequency flashlight combined with ultrasound can enhance deterrence, especially at night or in low light environment. Specification: Item Type: Ultrasonic Dog Barking Repellent Devices Material: plastic; Usage: Ultrasonic Animal Training Battery type and quantity: 1 x 18650 lithium battery (1200 mAh) (included) Charging time: 1 hour Usage time: 2 weeks Light color: white light, red light, green light, blue light, purple light, red and blue alternately 3 Frequency: 1. Constant Frequency: Provide your dog with continuous stimulation. 2. Variable Frequency: The frequency changes regularly and operates in frequency sweep mode. 3. Random Frequency: The frequency changes randomly to better fit do most dogs. List of packages: 1 x Ultrasonic Dog Barking Repellent Devices 1x USB cable 1 x Manual