The Compact, Lightweight Micro-iDT Training Collar! 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 Series represent 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 Series collars feature Sixteen levels of stimulation intensity, with an easy 'no look' clicking stimulation dial. Easy one hand held operation allows for maximum control and safety.