Feature: 1. Flashlight Function: Barking control devices has an independent strong light flashlight, equipped with ultrasonic work indicator, independent ultrasonic button function, and the actual environment can up to 10 meters. Designed for the hearing characteristics of dogs, it is easier for dogs to understand and learn. 2. Ultrasonic Bark Control Device: Ultrasonic does not affect humans, but can get the dog's attention without hurting the dog; when the dog stops inappropriate behavior, give the dog food, threats or petting to enhance the effect of the training. 3. 6 Light Colors: The ultrasonic dog barking deterrent devices adopts 6 kinds of light colors that can be switched, it is safer to go out at night, and it is equipped with a power LED display design, which is more convenient to view and can be clearly seen at night. 4. Strong Battery Life: Portable barking control devices use a large battery, which has strong battery life, power saving and durable ultra long standby, which can be used for a long time, suitable for long distance travel, indoor or outdoor activities, without worrying about power consumption. 5. Portable: Barking control devices' portable design is suitable for indoor or outdoor use, can be used to train dogs with ultrasound or carried around to drive other animals, high frequency flashlight combined with ultrasound can increase deterrence, especially at night or in low light environments . Specification: Item Type: Ultrasonic Dog Barking Deterrent Devices Material: Plastic Usage: Ultrasonic Pet Training Battery Type and Quantity: 1 x Lithium Battery 18650(1200mAh) (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. Fixed Frequency: Give the Dog Continuous Stimulation. 2. Variable Frequency: the Frequency Changes Regularly and Works in Sweep Frequency Mode. 3. Random Frequency: the Frequency Varies Randomly to Better Match Most Dogs.. Package List: 1 x Ultrasonic Dog Barking Deterrent Devices1 x USB Cable1 x Manual