【Automatic Protection Mode】 The collars will automatically enter into sleep mode for 1 minute to calm dog's mood, after releasing pulse seven times in one minute. This smart function can avoid over-stimulation to your dog, if the dog cannot stop barking while strangers around. Press any button to re-enter the work mode, or it re-enter the work mode automatically after 1 minute. 【Progressive Sensitivity Adjustment】 To prevent stress the anti bark mechanism is delivered through 7 progressive levels of sound and shock(Beep only/Beep+Shock). This ensures that your dog receives the minimum amount of stimulation required to prevent barking. 【Suitability】 For small, medium and large dogs weighing 3-68kgs or 10-140lbs with neck size 25-60cm or 10-24inches. Preferred by owners of Labrador Retriever, German Shepherd, Golden Retriever, Beagle, Bulldog, Yorkshire Terrier, Boxer, Poodle, Dachshund, Chihuahua etc. Do not wait! Help your Dog to stop barking! 【24H Sale Service】 The professional material insure the quality of item. Please send email to our company's mailbox, we will give you a satisfied solution in 24 hours. 【Package Included】1 X Anti Barking Control Collar, 1 X Nylon Belt, 1 X Battery, 1 x static shock test light, 2 pairs metal prongs, 2 pairs rubber conductive anti-injury prongs, 1 x User Manual.