Bluetooth ear pieces such as the Nokia BH-700 are available on eBay. So are their counterfeits. How do you tell them apart? Here is my experience:

Counterfeit #1:

1- Purchased directly from Hong Kong. It arrived with a Chinese language owner's guide, which wasn't a surprise considering the source. It had the correct accessories.
2- Worked for the first few days then would not take a charge.
3- When it did work it had a very static filled signal.
4- The blue LED never appeared. Red and green were the only colors that appeared. Blue was supposed to appear upon connection to my phone.
5- Sound quality was no where near as nice as the BH-200 it was replacing.
6- LED illuminated the entire top third of the device through the thinly painted plastic. On my genuine BH-800 the LED is a pencil point and not at all diffuse. I am assuming that Nokia LED philosophy of what an LED should look like applies to both items.
7- The second time I attached the charger the red led flashed and then nothing. Unit is dead due to malfunction of the charger receptacle circuit board interface. I pulled the thing apart and can make it charge if I hold my thumb on the circuit board. I have better things to do.

Counterfeit #2:

1- Bought this one from a seller located in the United States.
2- Looks exactly like the one from Hong Kong.
3- It had a Chinese language owner's guide, a non-original and also non-fitting neck strap attachment. I didn't expect this from a New York seller.
4- This unit failed to show the blue LED upon connection.
5- It had the same, or worse, static problem.
6- The other reason it resembled the first counterfeit is that it has the same serial number! See the photo below.

Both of these BH-700s are bogus!                                               This is a genuine unit

Bogus Boards. Images of genuine boards are available at the FCC web site. Search on the FCC ID which is PYAWE02M.

(https://gullfoss2.fcc.gov/prod/oet/forms/blobs/retrieve.cgi?attachment_id=687100&native_or_pdf=pdf)

There are several PDF files that contain images of the exterior and the interior of a genuine unit.

(https://gullfoss2.fcc.gov/prod/oet/forms/blobs/retrieve.cgi?attachment_id=687072&native_or_pdf=pdf)

Also there is a PDF that has excellent diagrams of what the label should look like.

(https://gullfoss2.fcc.gov/prod/oet/forms/blobs/retrieve.cgi?attachment_id=687070&native_or_pdf=pdf)

It specifies the label is laser printed. The units above on the left have the information screened on.

Distinguishing marks of the counterfeits.

Silver paint job is thin. The real units are color through the plastic.

Edge of plastic housing where back attaches is white, not silver. In the circuit board photo above you can see the white interior that indicates the plastic is painted, not solid color through the plastic.

Rubber pad around speaker is somewhat ill fitting.

Has Serial Number beginning with 069459762 and ending with 1000638. The serial number provides a lot of information. It takes the format of VVVVVVYWWDLLSSSSSSS. 

The first six digits are the manufacturer code assigned by Nokia.
The next digit "Y" is the production year. 3=2003; 4=2004, 5=2005, 6=2006, 7=2007, etc.
The next two digits WW are the week code and indicate week 1 - 53 of the year.
The day of the week is indicated by the next digit "D" with 1= Monday , 2 = Tuesday and so on.
The next two digits LL indicate the production line as a two digit number.
The last seven digits "SSSSSSS" are the running serial number of the individual unit.
The last seven digits are reset every day.

The above serial number is bogus because the possible digits for the eighth position are 0 - 5. This has a 6 in that position.

LED illuminates top quarter to third of the device not just the LED jewel.

Blue LED is a no-show upon connection. LED remains green when searching for device and when connected.

Device has poor quality signal compared to less expensive and more expensive Nokia Bluetooth devices.

Device has a signal with much static.

Numerous internal differences such as wiring to the battery instead of soldered straps. Failure to twist the microphone wires around each other before attaching to circuit board. DC connection is black plastic, not dark gray as in the genuine item.

Necklace is flat ribbon, not woven. The attachment is a closed loop, not an open loop, although I've received both correct and incorrect attachments.