Apple Watch Series 4 (GPS, 44MM) – Space Gray Aluminum Case with Black Sport Band (Renewed)

Amazon.com Price: $294,95 (as of 26/02/2021 23:10 PST- Details) & FREE Shipping.

64-bit dual-core S4 processor. Up to 2x faster than S3 processor
Electrical heart sensor (ECG app)
Second-generation optical heart sensor