ENPHASE ENV-120-02 M, Envoy Communications Gateway w/ Wireless USB adapter (WiFi 802.11b/g/n), with Lifetime MyEnlighten System level monitoring. Envoys are recommended for all instances where electrical parameters need to be adjusted, such as in Mexico.
The whole system sounds great, but the major problem with the envoy communicating with the micro inverters is its use of Power Line Communication. Any other device plugged into a power outlet may or may not cause interference, if it does, it renders that location useless and the device may or may not detect all or some of your panels. Check Enphase's list of devices which can cause interference. If the system used a different communications method then it wouldn't be so bad.