Nokia Lumia 510 - Get Started; Phone Hardware Overview

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Keys and parts
1 Connector for headphones and loudspeakers (3.5 mm)
2 Earpiece
3 Proximity sensor. Do not cover, for example, with protective film or tape.
4 Volume key
5 Power/Lock key
6 Camera key
7 Microphone
8 Back key
9 Start key
10 Search key
11 Micro-USB connector. Used also to charge the battery.
6 Get started