ESP-04 ESP8266 serial WIFI

product description
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ESP8266 each have their own choice of features: 1, ESP-01: PCBA antenna matching, the distance to do open about 400 meters, easy to use. Buy 2, ESP-02: SMD package, suitable for submission of restrictions, the antenna available IPXHead leading to the shell. 3, ESP-03: SMD package, built-in ceramic antenna technology, all available IOLeads to.4, ESP-04: SMD package, the customer can customize the antenna type, design flexibility, all can IOLeads set to 5, ESP-05 : SMD package, can only lead to the serial port and RF pin, small size, the antenna can be external. 7, ESP-07: Half-hole chip technology, all magnetic head, with metal shielding, also can CE certification, external IPX antenna can also be an external IPX antenna can also be an external IPX antenna can also be an external IPX antenna , Built-in ceramic antenna available.