---
title: "NPC_UseVehicleSiren | open.mp"
description: "Makes an NPC use or stop using a vehicle siren."
canonical: https://omp.itsneufox.com/docs/scripting/functions/NPC_UseVehicleSiren
language: en
---

# NPC\_UseVehicleSiren

warning

This function was added in omp v1.5.8.3079 and will not work in earlier versions!

## Description

Makes an NPC use or stop using a vehicle siren.

| Name | Description |
| --- | --- |
| npcid | The ID of the NPC |
| use | `true` to use siren, `false` to stop (default: true) |

## Returns

Returns `true` if the operation was successful, `false` otherwise.

## Examples

```c
public OnPlayerCommandText(playerid, cmdtext[])
{
    if (!strcmp(cmdtext, "/npcusesiren ", true, 13))
    {
        new npcid = PlayerNPC[playerid];
        if (npcid == INVALID_NPC_ID)
            return SendClientMessage(playerid, 0xFF0000FF, "You are not debugging a NPC.");

        if (!NPC_IsValid(npcid))
            return SendClientMessage(playerid, 0xFF0000FF, "Invalid NPC.");

        new veh = NPC_GetVehicle(npcid);
        if (veh == INVALID_VEHICLE_ID)
            return SendClientMessage(playerid, 0xFFFF00FF, "NPC %d is not in any vehicle.", npcid);

        new bool:use = strval(cmdtext[13]) ? true : false;

        new bool:success = NPC_UseVehicleSiren(npcid, use);

        SendClientMessage(playerid, 0x00FF00FF, "NPC %d vehicle siren %s: %s", npcid, use ? "enabled" : "disabled", success ? "Success" : "Failed");
        return 1;
    }
    return 0;
}
```

## Notes

-   Only works when the NPC is in a vehicle as driver
-   The vehicle must support sirens (emergency vehicles)
-   Siren state persists until changed or NPC exits vehicle

## Related Functions

-   [NPC\_IsVehicleSirenUsed](https://omp.itsneufox.com/docs/scripting/functions/NPC_IsVehicleSirenUsed): Check if siren is being used
-   [NPC\_GetVehicle](https://omp.itsneufox.com/docs/scripting/functions/NPC_GetVehicle): Get NPC's current vehicle
-   [NPC\_PutInVehicle](https://omp.itsneufox.com/docs/scripting/functions/NPC_PutInVehicle): Put NPC in vehicle
-   [NPC\_Move](https://omp.itsneufox.com/docs/scripting/functions/NPC_Move): Make NPC drive to location

## Related Callbacks

_No specific callbacks are triggered by this function._