Credit card machines for small businesses can be expensive and a hassle, and often you have to enter into a contract with a company for the equipment and the service. But if you’re a small business like me, a super-easy credit card reader like Square may be just the ticket.

Square is a tiny little card reader that slips into the audio port of your Android phone, iPhone or iPad. You set up a free account, get a free reader and can start swiping cards immediately. The system is linked to your bank account, and the money transfers in the next day. They charge no setup or maintenance fees, and take just 2.75% out of every transaction. They’ll even help you calculate and keep track of sales tax.

I’ve been practicing with the reader by charging the price of my book on my husband’s credit card. He doesn’t know it yet, but he is going to have plenty of copies to give away for Christmas.

Watch my full review here:

Square made Beth’s Top Financial Tools list!