Don't know about demo at Apple Store but setup of ECG required Health app on my iPhone. So if you already have an iPhone, you can just 'buy' the watch, use it f

Don't know about demo at Apple Store but setup of ECG required Health app on my iPhone. So if you already have an iPhone, you can just 'buy' the watch, use it for couple of weeks and return it if it doesn't interest you using Apple 14 day return policy.