?This is high quality HT-023 Smart Dog Pet Electric Fencing Shock Collar System Receiver. It is among the most reliable， cost-efficient pet containment systems available today. It works by producing a radio signal from the fence transmitter through boundary wire. And the receiver collar will give the dog a warning beep once it reaches the warning zone while a safe vibration or shock correction will be delivered through the contact points until the dog returns to the pet area. No harm to your pet!                                    Features            New and high qualityLow power consumptionThe receiver is compact and portable to carryEasy to useSuitable for those stubborn or hard-to-train petsTrain your pet with warning beep and safe vibration &amp; shock correctionNo harm to your pet                                                             Specifications             Color     Black    <br> Material     ABS，Nylon    <br> Power Supply     1 x 4LR44 6V Battery    <br> Dimensions     2.56 x 1.18 x 1.46" / 6.5 x 3 x 3.7cm (LxWxH)    <br> Weight     2.92 oz / 83 g     <br>                                                             Package Includes            1 x Bulb<br>2x Screws<br>1 x Receptor<br>1 x Battery<br>                                                            Extra Info            Notes:<br>1.Pls read the instructions before using the item<br>2.The electronic dog collar is intended only for using on dogs<br>3.A low battery may cause intermittent operation， dont use it if you suspect a low battery<br>4.Allow your dog to get used to the collar before you begin training<br>5.Do not leave the collar on your dog for more than 12 hours per day<br>6.Never perform set-up procedures when the collar in on your dog<br>7.An electronic collar should only be used under close supervision by the dog▽s owner.<br>8.Keep outof the reachof children.9.The attached battery in the package is only for testing. It is advisable to change a new battery for normal use.