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Link | Apple Watch Series 5 40mm | Apple Watch Series 5 44mm | Apple Watch Series 4 40mm | Apple Watch Series 4 cellular 40mm | Apple Watch Series 3 cellular | Heart rhythm irregularity sensor EKG | Heart rhythm irregularity sensor EKG |
|---|---|---|---|---|---|---|---|
| Image |  |  | |||||
| Dimensions | |||||||
| Screen resolution | 324x394 | 368x448 | 324x394 | 324x394 | 340x272 | ||
| Always on display | Yes | Yes | No | No | No | ||
| Features | |||||||
| Built-in memory | 32 GB | 32 GB | 16 GB | 16 GB | 16 GB | ||
| Processor | Apple S5 dual core | Apple S5 dual core | Apple S4 dual core | Apple S4 dual core | |||
| Compatibility | iPhone 6s or later | ||||||
| Operating System | watchOS 6 | watchOS 6 or later | watchOS 5 | watchOS 5 | watchOS 4 | ||
| Built-in microphone | Yes | Yes | Yes | Yes | Yes | ||
| Sensors | |||||||
| Heart rate sensor | Yes Optical, Electrical | Yes 2nd Gen Optical, Electrical (ECG) | Yes Optical, Electrical | Yes Optical, Electrical | Yes | ||
| Connectivity | |||||||
| Battery | |||||||
| Battery life | 18 h | 18 h | 18 h | 18 h | 1 day | ||
| Design | |||||||
| Interchangeable straps | Yes | Yes | Yes | Yes | Yes | ||
| Input method | Digital crown, Multi-Touch, Force Touch, Microphone, Siri, connected iPhone | Digital crown, Multi-Touch, Force Touch, Microphone, Siri, connected iPhone | Digital crown, Multi-Touch, Force Touch, Microphone, Siri, connected iPhone | Digital crown, Multi-Touch, Force Touch, Microphone, Siri, connected iPhone | |||
| Heart rhythm irregularity sensor EKG | ✅ | ✅ | ✅ | ✅ | ❌ |
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