> For the complete documentation index, see [llms.txt](https://developer.magtek.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developer.magtek.com/hardware/card-readers/mms-dyna-devices/dynaflex-ii-go/documentation/user-manuals/installation-and-operation-manual/user-interface.md).
# User Interface
This section contains information on DynaFlex II Go's LEDs, beeper, and BCR status LED. It is important to note that DynaFlex II Go devices are equipped with an optional rechargeable battery. If there is no power supply to the device through the USB cable or optional internal rechargeable battery, all LEDs, along with the BCR status LED, will not illuminate. When this occurs, the user interface will resemble the device as shown in Figure 7-1.
As mentioned in section 1.1 Key Features and Components, DynaFlex II Go models equipped with a barcode reader (BCR) have a similar physical appearance as models without a BCR, as shown in Figure 7-1. BCR models are equipped with a camera and a QR code located on the front side of the device.
* DynaFlex II Go devices have a user interface composed of three elements: a visual indicator consisting of four LEDs, a beeper that produces audible alerts, and a power button see Figure 6-1 - Power Button.
* DynaFlex II Go BCR devices have a user interface composed of four elements: a visual indicator consisting of four LEDs, a barcode reader status LED, a beeper that produces audible alerts, and a power button see Figure 6-1 - Power Button.
* DynaFlex II Go devices do not feature input components such as touch screens.
Figure – DynaFlex II Go and DynaFlex II Go BCR
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