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Specifications: Item Size: 2.6 X 1.5 X 1 inches Item weight: 70g Package weight: 120g Collar Perimeter Size: 7.4-23.5inches Package Includes: 1 x No bark receiver 1 x Adjustable Nylon Collar 1 x Test Light 1 x USB Link 1 x Instruction NOTE: 1, Charge it before first use (adapter less than 1A). 2, If you need to adjust the strap and cut the redundant part of it, heat the end of the strap with a lighter, in case it get a raw edge. 3, Don’t wear it exceeding 10 hours a day, or it may affect the dog's skin. 4, Don’t let the dog alone at first several times. 5, Check the tightness of the strap and your pet skin regularly.The prongs must be against your pet skin to work,you just can fit one fingers snuggle between the neck and collar. 6, Please take off your iron collar,before you put the bark collar