Fund transfer with the debit card, just in case you don't have your smartphone with you.
The Google Wallet Card is a debit card that lets you quickly access your Wallet Balance, whether you’ve received it from a friend or added it directly from a linked bank account or credit/debit card.
With the Google Wallet Card, you can:
Spend anywhere. Use your Wallet Balance to shop and pay in stores by swiping your card at millions of MasterCard® locations.
Get cash at ATMs. Withdraw money from your Wallet Balance at ATMs. Some ATM providers may charge you a fee for cash withdrawals.
Receive instant notifications when you spend money. Get instant notifications right on your phone to help you keep tabs on all of your transactions.
Be free of annual or monthly fees. You can order the Google Wallet Card for free, and there are no annual or monthly service fees to use the card. Google Introduces Wallet Debit Card [googlecommerce.blogspot.com]