HTC 3125 - Manual (Page 17)

Getting started 17
Accessories
The following accessories are provided with the device:
1
2
3
Accessory Function
1. AC Charger Recharge the device battery.
2. USB cable Connect your device to a PC and synchronize data.
3. Stereo headset Provide a volume control jog dial and a Send/End button.
You can use the button to pick up and hang up incoming
and outgoing calls. Plug into Earphone/Sync connector to
listen to audio files.