Yes, Samsung HM1350 does have call reject button.
No. Samsung HM1350 is meant only for voice calls.
Samsung HM1350 standard packaging includes, Bluetooth Headset, Earrings, Clip, User Manual and Micro USB Cable.
No. It does not have HD Voice support.
To connect Samsung HM1350 with your smartphone, please follow the below steps.
01) Make sure that your smartphone's Bluetooth is switched ON.
02) Switch ON your Samsung HM1350
03) Now search for the visible devices on your smartphone
04) select Samsung HM1350
and you're done.