Hi
All models of Apple Watch (not "iWatch") are supplied with an Apple Watch Magnetic Charging Cable.
Apple Watch Series 3 models also:
- Include a USB Power Adapter.
- Support Apple's recently announced wireless charging mat, the AirPower mat, which is due for release next year.
Apple Watch Series 1 models:
- Do not include a USB Power Adapter.
- Are not compatible with the AirPower mat.
More information: