Nokia Lumia 521 User Manual page 43

1. Connector for headphones and speakerphones (3.5 mm)
2. Earpiece
3. Volume keys
4. Power/Lock key
5. Camera key
6. Back key
7. Start key
8. Search key
9. Micro-USB / charger connector
10. Microphone
11. Camera lens
12. Speakerphone