Gb - 17- Insert the new battery paying attention to the polarity indicated under the battery holder (SeeDiagram 2).- A beep sound is emitted indicating that the battery was properly inserted.If you do not hear any beep sound after inserting the battery, immediately remove it from thebattery holder by using the supplied magnet (magnetic key) or by tapping briefly the case in thepalm of your hand. Check the polarity before inserting the battery once again. If you still do nothear any beep sound, check the operation by switching the collar On and Off.- Put the battery cover back in place taking care to insert first the little pin at the bottom of thebattery cover (See diagram 3).- Retighten moderately the 2 screws.Changing the sensorTwo different length sensors are included in the package. The size should be long enough tohave proper contact with the dog’s skin, enabling the device to operate correctly.If you have a long haired dog and the short sensor fitted to the collar in the factory is inadequate,remove the short sensor and replace it with the long one supplied with the kit.When changing the sensor, do not press on the threaded rod, it could damage the componentsunderneath. A moderate manual screwing is sufficient (do not use any key). If you screw thesensor too much, bark detection is likely to be inefficient.Fitting the collarThe strap should be adjusted so that the sensor comes right into contact with the dog’s skin inorder to ensure good barking detection.- If the strap is too loose, the collar will not operate properly. Moreover, it might move aroundthe dog’s neck and repeated rubbing of the sensor on the skin can cause irritation.- If the strap is too tight, the dog will have difficulties in breathing.Regularly check your dog’s neck as repeated rubbing of the sensor on the dog’s skin may causeirritation. If this happens, remove the collar until all signs of skin irritation have disappeared.Do not leave the collar more than 8 hours a day around your dog’s neck and take the time tocheck that there are no signs of irritation when your dog is not wearing it.