只要没发货,就跟买家联系就好了。这边的卖家也蛮好沟通的,跟淘宝差不多。就告诉他们说,i just realized that the model i picked from your store was wrong. Fortunately the item hasn't been sent yet. i will turly appreciate it if we can cancel the transaction. i hope it didnt bring you too much trouble. i will definately come back to your store after i find out the proper model i need. thanks again. XXX