Manufacturer Specification   Suitable for small, medium, large dog and puppies, 15 LBS or more.   Nylon necklaces are durable and adjustable in length from 14 to 27 inches.   Include 1 or 2 necklaces.   The remote transmitter can control up to 2 necklaces.   100% brand new and high quality.   Range :300-500 yards   Three modes: impact, vibration and tone   Colour: blue, black, red   Product category: collar   Is it scalable?  Yes   Material: plastic   Stimulus grade :5 grades shock and vibration