diff --git a/homeassistant/components/rfxtrx/__init__.py b/homeassistant/components/rfxtrx/__init__.py
index 9c5ffa586cd..3ce45e5610e 100644
--- a/homeassistant/components/rfxtrx/__init__.py
+++ b/homeassistant/components/rfxtrx/__init__.py
@@ -6,7 +6,7 @@ import binascii
 from collections.abc import Callable, Mapping
 import copy
 import logging
-from typing import Any, NamedTuple, cast
+from typing import Any, NamedTuple, TypeVarTuple, cast
 
 import RFXtrx as rfxtrxmod
 import voluptuous as vol
@@ -50,6 +50,8 @@ DEFAULT_OFF_DELAY = 2.0
 
 SIGNAL_EVENT = f"{DOMAIN}_event"
 
+_Ts = TypeVarTuple("_Ts")
+
 _LOGGER = logging.getLogger(__name__)
 
 
@@ -559,6 +561,8 @@ class RfxtrxCommandEntity(RfxtrxEntity):
         """Initialzie a switch or light device."""
         super().__init__(device, device_id, event=event)
 
-    async def _async_send(self, fun: Callable[..., None], *args: Any) -> None:
-        rfx_object = self.hass.data[DOMAIN][DATA_RFXOBJECT]
+    async def _async_send(
+        self, fun: Callable[[rfxtrxmod.PySerialTransport, *_Ts], None], *args: *_Ts
+    ) -> None:
+        rfx_object: rfxtrxmod.Connect = self.hass.data[DOMAIN][DATA_RFXOBJECT]
         await self.hass.async_add_executor_job(fun, rfx_object.transport, *args)