Uses 15 amp relay. Awkward to open. Flat plastic back pops into plastic shell but is glued. Power prongs are also lightly glued to the flat plastic back.
Uses an edge mounted daughter board for the ESP8266EX. Flashing leads for 3.3V, GND, RX and TX can be soldered to the edge mounting. Used the test point landing for GPIO0 on the daughter board test points side.
LED will light when relay is engaged. Side button will toggle the relay state.