If it's a new model, check the LG website. If not, then google "instruction manual" for that make and model, and that should work. Good luck! Oh, you can also try contacting the tech support department at the LG website. They might be able to assist you as well. Once again, good luck, my friend!
You can get manual of LG Bluetooth headset HBM-230 from their official website. You can also get a PDF file from http://www.megaaccy.com/HBM_230.pdf website. The LG HBM-235 Bluetooth Headset is a very lightweight and amazingly comfortable wireless headset that can keep you connected all day.
I don't know why people are giving info for the 730, the original poster is asking for the 230. The 230 link for the manual above at megaaccy.com is for the 730 not 230. I'm looking for it, too. Can't find it anywhere.