The DigiDop 300 manufactured by Newman Medical has unique features that cannot be found in other Doppler systems such as Digital Optimized Processing (DOP™). The DigiDop 300 is designed to last for longer years and is also very durable to withstand every day use. All Newman Medical products are manufactured in the USA and each DigiDop 300 must pass a series of control measures to ensure durability and quality of each product. The DigiDop 300 is made out of polycarbonate and stainless steel case and has an "unbreakable" magnetic probe holder. The probes are interchangeable and each main unit comes with a choice of a single probe.