Well, we have defined model of your device here. So just look at the list and choose manual for Revolabs Wireless Office Headset 10-FLX2-200-VOIP 10-FLX2-020-VOIP 10-FLX2-002-VOIP 10-FLX2-101-VOIP.
On the next page you will be able to read or download PDF file.