Some suppliers on Alibaba.com charge as low as USD 0.18 per piece, some charge USD 0. As such, most manufacturers of this type of USB adapter are compatible to, this should not be overlooked. Alibaba.com offers many options to choose a type of adapter that is compatible with most users,
Yes, it is possible to use an irda USB adapter instead of a standard one. Others charge USD 1.50 to USD 1.50 per piece and many other designs at the same time.