Introduction:The Anti-Bark collar stops barking with progressively increasing sound and shock which is controller by a microprocessor distinguishing your dog's bark from other environmental noises and automatically delivers sound and shock after each bark.Principles of operationAt the first bark，Anti-bark Collar applies a short warning tone.If a second bark occurs within thirty seconds，a more intense tone is sounded，From the third bark，a more intense tone is sounded along with a short，mild shock.This pattern is repeated through 7 correction levels.The first two levels are only with progressively warning tone.If your dog continues to bark through the rest five levels，the more intense sound and shock are applies after each bark until your pet stops for thirty seconds.and then Anti-bark collar will automatically resets to the first "tone" level of correction.To protect the dog，if the continuous stimulus reaches the 7levels，then the collar will stop working for 1 minutes.The use of the warning tone followed by increasingly in these tones and shocks sets up a pattern that your dog will quickly learn is caused by its own barking.It takes time to break bad habits.When your dog forgets and barks again.the warning tone reminds your pet without immediately applying painful stimulus.At each step，your dog gets to choose whether it's worth the increasing pain to bark again.We have found this technique of progressively increasing sound and shock is not only more humane.it's more EFFECTIVE in breaking the barking habit than conventional chocking bark control collars.PET852 can be adjusted to control the sensitivity of the voice，according to the size of dogs barking.Nylon Collar Length: Adjustable between 35cm-51cmPackage content:1* Transmitter.1* Dog Collar..1* Test Light.1* metal probes1* User Manual.1* Battery1.The color difference is hard to avoid in the internet sales. Generally we will adjust the colors as the same as the items，but there might be a little color difference according to different light，different monitor. So if dear you can not accept this very little difference， be cautious before you making the orders.2.No Instructions or tools are provided for this listing.This is NOT an easy job for someone who has no technical skills with Disassembling or Assembling Cellphones/mobile phones So only purchase this item if you know how to install it.We will not be held responsible for any damages to your cellphone/mobile phone that you may cause during the changing of replacement parts.3.International Buyers _ Please Note:.Import duties， taxes and charges are not included in the item price or shipping charges. These charges are the buyer's responsibility. Please check with your country's customs office to determine what these additional costs will be prior to bidding/buying.1.Usually， We ship via USPS regular shipping to USA， other countries will by HK-post/China post flat shipping.2.Item will be shipped out within 1- 2business days upon your payment completed (Excluding Weekends and Public Holidays).3.Delivery time lasts approx:A) United States: 8-22business daysB) Australia， United Kingdom: 15 - 25 business days.C) Spain， France， Germany， Canada : 15-30 business days.D) Other countries: not more than 35 business days.4.Please contact us if your item had not been delivered after 4 weeks. But we strongly recommend the buyer using Expedited Service EMS shipping， which is faster and safer than Airmail and in reasonable price. Also， If you refer to DHL， Fedex， UPS and other express shipping， please let us know.We can only accept Paypal payment only. You can sendpayment to our paypal account by many payment methods1.If you are not satisfiedfor any reason (Broken， Defective， Purchased in error) please contact us within 3 daysafter delivery.2.Please contact us ABOUTTHE RETURN ADDRESS if you need to return the item， Do not return the item to the addresswhich shown on the package (it is not our office?s address). Otherwise， we can not receiveit. Please also leave a note in the package and write your Buyer ID and Seller ID. Then wecan resolve it soon once we get it.3.All items must bereturned in their original condition， in order to quality for exchange of goods. We onlyaccept the original package. Please make sure the item have NO man-madesabotage.Only defectiveproduct can be offered exchange， we will not be responsibility if someone who damaged theitem when install it.Please NOTE that the shipping and handling feewill not be refunded， all return shipping fee should paid by the buyer.4.We reserve the right torefuse any returns for objective reasons.1.Positive feedback isautomatically done once the payment is cleared. We appreciate your feedback.2.The star-scores are veryimportant to us. If anything about your transaction did not meet yourexpectations.Please let us know and give us theopportunity to work out for you before you leave feedback.1.Usually， we reply forthe messages within 24 hours， if you do not get response within 1-2 business days(Excluding the holidays)， please check your Messages box one more time or Please email usAGAIN.2.Email is the priority ofour customer service， if you can't get us， please choose live response.On Mar-23-15 at 04:34:24 PDT， seller added the following information: