I was very hesitant to purchase this item. In a sea of "smart technology" I am a very UN-Tech type of person and I was very concerned about being able to set up and use this device. Very pleased to discover how incredibly easy and user friendly it is. The accuracy is spot on as well... my daughter used her smart watch to track bpm and we compared results to my little oximeter and it was perfect accuracy match! Love how sturdy and well made it is also!. 5 star review from me!