1.Can be used as an I / O module 2.All IO leads. 3.With antenna, further away than the others. 4. IPX interface on board. 5. low consumption, and more cheaper. 6.Sending the ESP8266 serial port module receiving ESP-201 WIFI wireless I / O reception. 7.Color: white + black. 8.Size: 3.3 x 2.5.1cm.
