Product description What can you do when your pet dog starts barking non-stop? With the ultrasonic dog trainer,you can train your pet to be obedient,corrects misbehavior and stops barking.The trainer is based on the theory that ultrasound (more than 20KHZ)is above the upper limit of human hearing and super ultrasonic and 2800mcd strong white light. It can activate visual and additive activation to dogs, cats and other animals.They are harmless to both humans and pets.It is portable and handheld, also convenient for you to carry anywhere you need, such as jogging or walking, cycling, park and so on. If the light gets dim, please change the batteries.timely.The battery is not included in the package, please buy it by yourself. Specification: Material:Plastic Color:Yellow Powered by:9V battery(not included) Weight:64g Frequency:25 KHz Max current:130 MA Size:4.92*1*1.77inch Features: What can you do when your pet starts barking without stopping? With the ultrasonic trainer for dogs, you can train your pet to be obedient, correct bad behavior and stop barking. Notes: 1.The battery is not included in the package, please buy it by yourself. 2.If the light gets dim,please change the batteries timely.We recommend using rechargeable battery. Package Including Package Include 2xUltrasonic Training Device