Bought a couple of these because they are an absolute bargain. You can either push the litte phone holder into the vent of your blower or you get a little thing that sticks onto your dash that holds the phone. Then you connect the speak unit to your cigerette lighter and away you go!!!!!
To be honest I have speaker phone on my phone so I have just pressed the phone holder into my vent and just use it that way.
Best £1.00 I have spent for ages and got one as a stocking filler for my husband too. I am gonna go back at the weekend and get more for in-laws etc!!!