Do not purchase this item. I bought one in Feb 13 2009 and after useing it for about a hundred clicks the spring broke. I got in touch with the company at 1-781-583-7548, ATAFA at 101 First Street, Cambridge, MA. , and they would not replace the unit. If you order from them and the unit breaks your on your own.
Rating: [1 of 5 Stars!]