Mặt trước
1. Bluetooth button
2. Mute/Unmute
3. Phone input
4. Make/Answer call
5. Volume up
6. LED status indicator
7. Volume down
8. Hang up call
Mặt sau
1. Phone in
2. Daisy-chain up to three speakerphones and four microphones
3. Line out
4. Micro USB 2.0
5. LAN for IP remote access
6. DC 12V
Hỏi đáp về: Thiết bị Mic- Loa AVer FONE540