http://www.dtsystems.com/products/micro-idtplus.html D.T. Systems Micro-iDT PLUS Collar; Dog Training Collar D.T. Systems is proud to introduce the new Micro-iDT PLUS, a lightweight trainer that offers simple controls, but advanced features so that this unit can grow with your dog’s training needs. This system can expand to a 2-dog or 3-dog system. The rugged micro-sized collar unit and transmitter fit in the palm of your hand. The comfortable waterproof collar fits small to large dogs. The Micro-iDT PLUS represents the absolute latest technological advancement in the Electronic Dog Training World. It offers Maxx-Range™, the industry’s only internal FM radio frequency antenna woven in the collar. With up to a 900 yard range, they are perfect for field or household use. The Micro-iDT PLUS collars feature 16 levels of Nick and Continuous stimulations, with an easy ‘no look’ clicking stimulation dial. Our Vibration features comes standard on this model. Easy one hand held operation allows for maximum control and safety. The collar unit is rechargeable and completely waterproof. The weatherproof transmitter uses a regular 9-volt battery and now has a No-Slip/Soft-Grip rubber coating. Vibration is a great feature with many different applications. Many of our competitors use a tone feature that makes the collar unit emit a quiet beep. We feel that Vibration is a more effective alternative because your dog is the only dog that will feel the vibration (other dogs can hear your dog’s tone and your dog may hear another dog’s tone command, which may cause confusion). Like with most humans, most dogs will also lose their hearing as they get older so it will become increasingly difficult for them to hear the audible tone, but they will always be able to feel the Vibration feature. Also, your dog will be able to feel the vibration when the collar unit is submersed under water if he ever decides to go swimming. The tone from other collars may not be heard if the collar is under water. Depending on how you train with it, Vibration can be a warning, a command, a way to get your dog’s attention, a substitution for stimulation (especially for sensitive dogs), or even a reward just to name a few uses.