I purched this board.
http://www.ebay.com/itm/ESP8266-ESP-12E-UART-WIFI-Wireless-Shield-TTL-Converter-for-Arduino-UNO-R3-Mega/201499125436?_trksid=p2047675.c100623.m-1&_trkparms=aid%3D222007%26algo%3DSIC.MBE%26ao%3D1%26asc%3D37252%26meid%3D388903879a9848acb630a102c0e1c841%26pid%3D100623%26rk%3D1%26rkt%3D6%26mehot%3Dag%26sd%3D171981792137
Which board i must select in IDE, when I connect with UNO?
And what is the switch situation?
Thanks.