Nokia Privacy Handset HSU-4

Nokia Privacy Handset HSU-4 – Private calls in your car
The Nokia Privacy Handset HSU-4 is for you if you would prefer to make and take certain phone calls in your car in privacy, and all of them in style.
With a Nokia Privacy Handset HSU-4 you can:
take calls in your car and keep them personal
manage your phonebook while on the road with the smooth, ergonomic keyboard
benefit from an alternative to your handsfree in-car kit if the need arises (compatible with the Nokia 610 Car Kit Phone, the Nokia 616 Car Kit and the Nokia 810 Car Phone)

Compatibility
Nokia 6120 classic
Nokia 6301