Before you buy please pay attention to the following tips: - We indeed has automatic shut off feature eliminates risk of overcorrection, If the collar continuously activates for 5 times, it will switch to be off for 1 minutes for safety. anyway, it will shock again in 1 minute if your dog keep barking. it will keep cycling for 5 shocks and 1 minute off. If you dog keep barking, please remove the collar safely, you should turn it off first before taking it off. - Our dog control collar is auto anti-bark collar, there is no remote included. - Shock and Vibration is strong, not suitable for weak dogs or dogs who are less than 15 pounds. - Our default set is on T level in order to test easily, you had better to adjust it on 3-4 levels when using avoiding too strong shocking. - Our highest sensitive level is 5 level, please lower the sensitivity level to level 1 if your dog is shocked too easily. - TaoTronics promises unconditionally return within 1 month, and 1 year full warranty. We can ship you free parts, replacement or refund your purchase if our products become defective within 1 year. - Please charge the collar first for 3-4 hours, because collar is not full charged when from factory - The Dog Training Collar is activated by vibration of dog"s vocal chords. Not from voice, If your dog accidently shocks himself when he is shaking his head or do some other thing, please lower the sensitivity level. - Please make sure that the collar is aligned with his throat area. It should make contact, but not too tight (or too loose), If the fur of your dog is too thick, please cut some off.