IoTaWatt uses a micro-USB supply to provide the 5V DC needed to power the onboard sampling circuitry and the ESP8266 WiFi processor that provides the processing and WiFi services.
The power supplies offered here are designed to power electronic devices (as opposed to chargers) and have been tested to work well to satisfy the requirements of the device at extremes of line-voltage. They are UL-Listed, wall plug type supplies and are equipped with a cable and plug to connect to the IoTaWatt.
A VT is included with a standard W14-NA. These are offered as replacements.
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