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The Sonoff Dual R2 offers control of 2 relays on one board. 



GPIOFunction
0Button 0 on header
1Serial Rx and Optional Sensor
3Serial Tx and Optional Sensor
5Relay 2
9Button 1 on header
10Button on Case
12Relay 1
13Blue Led


Hardware Preperation

This device uses the ESP8285 module which is different than the other SONOFF products. 

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From the Arduino IDE, click Sketch → Upload


Reference

ReferenceURL
Product Infohttp://sonoff.itead.cc/en/products/sonoff/sonoff-dual
Schematic for Dualhttps://www.itead.cc/wiki/images/1/1d/Sonoff_Dual_View.pdf
Sonoff-Tasmotahttps://github.com/arendst/Sonoff-Tasmota/wiki/Sonoff-Dual-and-Dual-R2
Sonoff-Tasmota Switch Modeshttps://github.com/arendst/Sonoff-Tasmota/wiki/Understanding-SwitchMode-and-SwitchTopic