The LED on a fake BH-214 pulses at different speeds blue when unconnected, creating new pairing, or connected, the LED is red only while charging and dark when finished, the low battery indicator is a very loud four beeps in the audio I dont belive it flashes red ever. A real BH-214 also has a green and yellow color in addition to red to indicate battery state and will only power up from the power button. The power and answer button are wired together on fakes and are used interchangeably.
I very much like my fake BH-214 although I would much prefer a real Nokia with the real power button less likely to be accidently pushed and battery indication lights though it would also require a battery mod for all day audio.
The BH-214 does require a 5.7volt 2mm charger so if you have an unboosted 5volt USB charger that is not enouigh.