1. WWAN antennas (select models) 13. Touchpad2. WLAN antennas 14. Touchpad pick buttons3. Dual-microphone array* 15. Touchpad on/off button with LED indicator4. Webcam LED indicator (with optional webcam) 16. Stereo microphone in5. Optional 720p HD webcam 17. Stereo headphone/line out6. Stereo speakers 18. Media Card Reader7. HP QuickWeb button with LED indicator 19. Hard drive activity LED indicator8. Wireless on/off button with LED indicator 20. Power button with LED indicator9. Optical drive (select models) 21. HP Power Assistant function key10. Optional RJ-11/modem port 22. Volume mute function key11. (2) USB 2.0 ports 23. Volume down function key12. Optional HP Fingerprint Sensor 24. Volume up function key* Models without optional webcam have single integrated microphone.QuickSpecsHP ProBook 4330s Notebook PCHP ProBook 4430s Notebook PCHP ProBook 4530s Notebook PCHP ProBook 4730s Notebook PCOverviewDA - 13948 Worldwide — Version 28 — August 2, 2012 Page 1