This Nokia HDA-10 audio adapter allows your phone to accept any 2.5mm jack headset simply by connecting this handsfree adapter to your cellphone! Simply plug this audio adapter into the bottom of your cellphone to convert the audio for use with any standard 2.5mm jack headset. FEATURES Small, lightweight adapter allows your phone to be connected to most TTY devices Attaches easily to bottom connector Nokia original accessories *Will ONLY work with mono 2.5mm headsets OEM Part# - HDA-10 This adapter also compatible with Nokia  3300 / 5100 / 5140 / 6100 / 6200 / 6230 / 6560 / 6600 / 6620 / 6651 / 6800 / 7210 / 7250i / 7610 Cellular Phones