The product is controlled by a microprocessor， distinguishes your dog's bark from other environmental noises and automatically delivers sound and shock stimuli after each bark. <br>The output level of sound and shock is gradually increased as barking continues， giving your pet plenty of warning before it becomes painful. <br>At the 1st bark the product applies a short warning tone. If a 2nd bark occurs within 30 seconds a more intense tone is sounded along with a short mild shock. If your dog barks a 3rd time， both the tone and shock become more intense. This pattern is repeated through 5 correction levels. If your dog continues to bark through all 5 levels， the most intense sound and shock are applied after each bark until your dog stops for 30 seconds or more. After 30 seconds of quiet， the product automatically resets to the 1st tone only level of correction. When your dog forgets and bark again， the warning tone reminds your dog without immediately applying painful stimulus.<br>Size: 6.5 x 3.4 x 2.8CM<br>Cable length: 48CM<br>Electronic heater head length: 20MM <br>Power: 1 X 4LR44 6V battery<br>With electric shock function， effective yet safe to the dog<br>Attention: it needs some time to take effect. The dog has conditioned reflex to the electric shock， if the dog is shocked everytime it barks， it will not bark gradually. Normally the adapting period is about 6 days， and varys with the breed of the dog<br>1 X Dogs training shock collar<br>1 X 6V battery<br>1 X User manual in English<br /><img src="http://img6.eachbuyer.com/x1/p10/bg01_1.jpg" />                                                        <img src="http://img6.eachbuyer.com/x1/p10/bg01_2.jpg" />                                                        <img src="http://img6.eachbuyer.com/x1/p10/bg01_3.jpg" />                                                        <img src="http://img6.eachbuyer.com/x1/p10/bg01_4.jpg" />                                                        <img src="http://img6.eachbuyer.com/x1/p10/bg01_5.jpg" />