v4 dip switches

docs/v4.md

@@ -26,6 +26,8 @@
 
     * Use the power supply and turn on PiKVM. The Mini comes with USB-C 5V power supply, and Plus with Barrel 12V. Use the appropriate connector on the **front** side. Please note that Plus can also work from 5V, in this case, do not connect a 12V power supply and don't create a significant power load on USB (external flash sticks, cameras, and so on).
 
+    !!! warning "Do not block the ventilation holes on the sides of the device. This is especially true for the V4 Plus, which has active cooling."
+
 2. Wait until PiKVM starts and shows a greeting on the built-in display. Do not turn off the device until it's fully booted for the first time.
 
 3. **Carefully read [the "First steps" guide](first_steps.md){target=_blank}** - how to find a device on the network, how to log in there, change passwords, and so on. **Follow the steps described there and come back to this page**.
@@ -61,6 +63,21 @@ To enable 1920x1200, follow [this manual](edid.md).
 [See here](atx_board.md).
 
 
+## DIP switches
+
+There is a pair of DIP switches on the V4 right side.
+
+| Right side |
+|------------|
+| <img src="plus_right.jpg" width="300" /> |
+
+* The left switch **[1]**. When pulled down (**ON** state), the advanced backpower protection is used.
+  The default state is **OFF** (up), "diode protection" is used.
+
+* The right switch **[2]**. When pulled down (**ON** state), the Power Delivery chip is activated on the USB OTG port.
+  The default state is **OFF** (up).
+
+
 ## Internal USB on V4 Plus
 
 The V4 Plus has an internal USB port that can be used at your discretion.