query: How expensive are whistles?
passage: Tin whistle
In recent years a number of instrument builders have started lines of "high-end," hand-made whistles, which can cost hundreds of dollars US each — expensive in comparison to cheap whistles, but nevertheless cheaper than most other instruments. These companies are typically either a single individual or a very small group of craftsmen who work closely together. The instruments are distinguished from the inexpensive whistles in that each whistle is individually manufactured and "voiced" by a skilled person rather than made in a factory.
passage: Whistle (company)
Whistle's first product, an activity monitor for dogs that tracked their exercise, was released in 2013. The company raised an additional $10 million in a Series A funding round and $15 million in Series B. A February 2014 agreement with PetSmart placed the Whistle device in all the company's stores and led to co-marketing efforts. Whistle also began working with veterinary schools to analyze the data collected from the app. For example, in 2014 the Pennsylvania School of Veterinary Medicine at the University of Pennsylvania used data from Whistle devices for their research on chronic pain conditions in dogs; and researchers at the College of Veterinary Medicine at North Carolina State University have used it to study epilepsy in dogs. The company also has an advisory panel of veterinarians.