1. Pet collar size: can be applied to the size of small， medium and large puppies. And even 15 pounds or larger. Durable and adjustable nylon collar length ranges from 14 to 24 inches long.<br />2. Automatic protection mode to avoid over stimulation of dogs， more safe and convenient.<br />3. A simple test method to ensure proper handling of the bark collar.<br /><br />Specification:<br />Item Type: Pet Train Collar <br />Material: ABS， Alloy<br />Color: Black <br />Sensitivity Level: 7<br />Automatic Tamper Resistant Collar: Yes<br />Programming Required: No<br /><br />Note: Error is allowable due to manual measurement please a lot of understandings: ).<br /><br />Package Included:<br />1 x Bark Collar Receiver<br />1 x Nylon Strap<br />1 x Test Light<br />3 x Set of Contact Point