> For the complete documentation index, see [llms.txt](https://www.multi-module.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://www.multi-module.org/using-the-module/protocol-details/mt99xx.md).

# MT99XX

## Details

**Protocol Number:**  17\
**Autobind:**  Yes\
**Channel Re-mapping:**  Yes\
**Extended Limits:**  No\
**Failsafe Support:**  No\
**Receiver Match:**  No\
**Telemetry:**  No\
**Option Value:**  YZ emulation mode and frequency fine tuning (see YZ sub-protocol notes)

## Notes

None.

## Channel Assignment

| CH1 | CH2 | CH3 | CH4 | CH5  | CH6 | CH7     | CH8   | CH9      |
| --- | --- | --- | --- | ---- | --- | ------- | ----- | -------- |
| A   | E   | T   | R   | Flip | LED | Picture | Video | Headless |

## Sub Protocols

## 0 - MT99

**Models:**  MT99xx

### 1 - H7

**Models:**  Eachine H7, Cheerson CX023

### 2 - YZ

**Model:**  Yi Zhan i6S

{% hint style="danger" %}
Only one transmitter ID is currently available for this protocol - take care that another MULTI-Module using the same protocol is not in range at the same time.
{% endhint %}

{% hint style="warning" %}
This sub-protocol is known to be problematic.  This is due to the emulation of the original radio's RF component.
{% endhint %}

If the model does not respond well to inputs, or is hard to bind, you can try to switch the emulation mode by using an option value (RF Freq. tuning) other than 0.

Once the value is not set to 0 it is used for frequency fine tuning.  See the [Frequency Tuning page](/using-the-module/frequency-tuning.md) for more details.

### 3 - LS

**Models:**  LS114, 124, 215

| CH1 | CH2 | CH3 | CH4 | CH5  | CH6    | CH7     | CH8   | CH9      |
| --- | --- | --- | --- | ---- | ------ | ------- | ----- | -------- |
| A   | E   | T   | R   | Flip | Invert | Picture | Video | Headless |

### 4 - FY805

**Model:** FY805

{% hint style="danger" %}
Only one transmitter ID is currently available for this protocol - take care that another MULTI-Module using the same protocol is not in range at the same time.
{% endhint %}

| CH1 | CH2 | CH3 | CH4 | CH5  | CH6 | CH7 | CH8 | CH9      |
| --- | --- | --- | --- | ---- | --- | --- | --- | -------- |
| A   | E   | T   | R   | Flip |     |     |     | Headless |