Apple Watch Series 1
Tech specs 
Size38.6mm x 33.3mm x 10.5mm (H x W x D)
32.0mm x 35.9mm x 10.5mm (H x W x D)
MaterialSteel, Aluminum, or 18k Gold (case), Sapphire Crystal
Charginginductive charging
BatteryLithium-ion
Battery life18 hours
Water-resistanceIPX7 (3 metres)
Weight25 grams to 69 grams depending on the model
SensorAmbient light, Heart rate sensor, accelerometer, and gyroscope.
DisplayRetina display with Force Touch
Screen size38mm: 340x272 pixels
42mm: 390x312 pixels
ColorsGold, Rose Gold, Space Gray, Silver, Black. Straps vary by editions.
OtherPLATFORM: watchOS
PROCESSOR: Dual-core Apple S1P
MEMORY: 8 GB, 512 MB RAM
CONNECTIVITY: WiFi, Bluetooth, NFC
Activity tracking 
StepsYes
DistanceYes
Calories burnedYes
ActivityYes
Floors
Sleep
Heart rateYes
Vo2Max
Stress & recovery
UV exposure
Skin temperature
Galvanic skin response
Hydration level
Calorie intake
GPS
Running features
Swimming features
Other
Non-fitness functions 
Smartphone notificationsYes
On-board music storageYes
Connected payYes
Links 
Affiliate link*Amazon
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