The first generation Apple Watch is available in stainless steel or space black with a stainless steel case. It includes a heart rate sensor, accelerometer, gyroscope and ambient light sensor. Wi-Fi (802.11b/g/n 2.4GHz) and Bluetooth 4.0 connectivity. It is water resistant and has up to 18 hours of battery life.
Apple Watch 1st Generation Technical Specifications
Model Number: A1553
Model Number: A1554