Refurb Apple Watch Series 4 Smartwatch (2018) from $220, More

Originally released September 2018
S4 with 64-bit dual-core processor (Up to 2x faster than S3 processor)
Electrical heart sensor (ECG app)
Water resistant to 50 meters1
LTPO OLED Retina display with Force Touch (1000 nits brightness)
Wi-Fi (802.11b/g/n 2.4GHz)
Bluetooth 5.0
Optical heart sensor
Improved accelerometer
Improved Gyroscope
Ambient light sensor
Capacity 16GB2
All ceramic and sapphire crystal back