diff --git a/homeassistant/components/harmony/select.py b/homeassistant/components/harmony/select.py
index a3f059d2c00..204e8ee4bd5 100644
--- a/homeassistant/components/harmony/select.py
+++ b/homeassistant/components/harmony/select.py
@@ -33,7 +33,7 @@ async def async_setup_entry(
 class HarmonyActivitySelect(HarmonyEntity, SelectEntity):
     """Select representation of a Harmony activities."""
 
-    _attr_device_class = f"{DOMAIN}__activities"
+    _attr_translation_key = "activities"
 
     def __init__(self, name: str, data: HarmonyData) -> None:
         """Initialize HarmonyActivitySelect class."""
diff --git a/homeassistant/components/harmony/strings.json b/homeassistant/components/harmony/strings.json
index 1a156ca863c..b676b1e1b04 100644
--- a/homeassistant/components/harmony/strings.json
+++ b/homeassistant/components/harmony/strings.json
@@ -32,5 +32,14 @@
         }
       }
     }
+  },
+  "entity": {
+    "select": {
+      "activities": {
+        "state": {
+          "power_off": "Power Off"
+        }
+      }
+    }
   }
 }
diff --git a/homeassistant/components/harmony/strings.select.json b/homeassistant/components/harmony/strings.select.json
deleted file mode 100644
index 5dbdf1a1c3d..00000000000
--- a/homeassistant/components/harmony/strings.select.json
+++ /dev/null
@@ -1,7 +0,0 @@
-{
-  "state": {
-    "harmony__activities": {
-      "power_off": "Power Off"
-    }
-  }
-}
diff --git a/homeassistant/components/harmony/translations/en.json b/homeassistant/components/harmony/translations/en.json
index dbc0dee16c5..22278d7f0d8 100644
--- a/homeassistant/components/harmony/translations/en.json
+++ b/homeassistant/components/harmony/translations/en.json
@@ -22,6 +22,15 @@
             }
         }
     },
+    "entity": {
+        "select": {
+            "activities": {
+                "state": {
+                    "power_off": "Power Off"
+                }
+            }
+        }
+    },
     "options": {
         "step": {
             "init": {
diff --git a/tests/components/harmony/test_select.py b/tests/components/harmony/test_select.py
index 60bb85ed0c3..f9f14963105 100644
--- a/tests/components/harmony/test_select.py
+++ b/tests/components/harmony/test_select.py
@@ -9,7 +9,6 @@ from homeassistant.components.select import (
     SERVICE_SELECT_OPTION,
 )
 from homeassistant.const import (
-    ATTR_DEVICE_CLASS,
     ATTR_ENTITY_ID,
     CONF_HOST,
     CONF_NAME,
@@ -74,7 +73,6 @@ async def test_options(mock_hc, hass, mock_write_config):
         "Play Music",
         "Watch TV",
     ]
-    assert state.attributes.get(ATTR_DEVICE_CLASS) == "harmony__activities"
 
 
 async def test_select_option(mock_hc, hass, mock_write_config):