diff --git a/Sonoff-Dual.md b/Sonoff-Dual.md
new file mode 100644
index 00000000..4df814a3
--- /dev/null
+++ b/Sonoff-Dual.md
@@ -0,0 +1,46 @@
+Sonoff Dual has been obsoleted by [Sonoff Dual R2](https://blakadder.github.io/sonoff_dual_R2.html). Before configuring your device check which revision you have since there are significant differences in how they operate.
+
+## Serial Flashing
+Please see the [Hardware Preparation](https://github.com/arendst/Sonoff-Tasmota/wiki/Hardware-Preparation) page for general instructions.
+
+As always, you need to access the serial interface. The **four serial pins** (3V3, Rx, Tx, GND) are available at the short end of the PCB and can be seen on the left side of the first image and are labeled in red on the second image.
+
+
+Alternative GPIO locations
+
+
+Programming the Sonoff Dual is more difficult because the on-board-button is not connected to GPIO0. As with all ESP8266 modules pulling GPIO0 to GND is needed to put the chip in programming mode. You need to **connect GPIO0 and GND** during power up.
+
+GND can be found on all three headers. *GPIO0* can be accessed in two ways:
+1. Unscrew the Sonoff Dual from the housing and access the underside of the PCB. You can find GPIO0 on one side of a resistor as shown in the second image.
+2. GPIO0 can be found on the small inter layer [via](https://en.wikipedia.org/wiki/Via_(electronics)) pointed at in the first image. **Attention:** If the via is covered by silk screen (green) you need to expose the underlying conductive (copper) by carefully scratching it off.
+
+## Restricted Button Functionality
+
+Please be aware, that the button on the Sonoff Dual will initially not have any functionality!
+
+The button is not connected to the normal button pin (GPIO0). After freshly flashing Sonoff-Tasmota (with the default module setting "Sonoff Basic"), the button will **not act as described** in the [Button Usage](https://github.com/arendst/Sonoff-Tasmota/wiki/Button-usage) article. You will not be able to switch power or activate the special WiFi modes.
+
+After configuring the device as "Sonoff Dual (5)", the button will regain normal functionality.
+
+## GPIO Locations
+
+GPIO4 = red, GPIO14 = orange
+
+
+## Solving intermittent relay switch errors
+
+Where most Sonoff's use GPIO to control one or more relays the Sonoff Dual uses the serial interface to control the relays.
+
+Commands are send from the ESP8266 via a 19200 baud serial connection to a dedicated chip that controls the relays.
+
+It is therefore important to disable any serial communication to and from the device once you have debugged any anomalies.
+
+To assist easy installation serial logging is enabled by default in Tasmota. For the Dual it is mandatory to turn it off withe `SerialLog 0` comand.
+
+Another reason for intermittent switching errors can be Power Saving. Make sure it is disabled by executing the command ```sleep 0```.
+
+## Official Sources
+* Itead Product Page: http://sonoff.itead.cc/en/products/sonoff/sonoff-dual
+* Itead Shop: https://www.itead.cc/sonoff-dual.html
+* Itead Wiki: https://www.itead.cc/wiki/Sonoff_Dual
\ No newline at end of file