If you have a lot of credit cards you are going to love this!!!

It's called Coin, coin is a smart card with uses Bluetooth 4.0 LE to store up to 8 credit cards and it has a battery that is supposed to last 2 years. If you need more info. on Coin I have installed this link: http://www.theverge.com/2013/11/14/5103820/coin-electronic-card-to-hold-all-your-credit-cards

All credit goes to Coin and The Verge.