diff --git a/devices/filters.py b/devices/filters.py
index ad7ea80..702f65c 100644
--- a/devices/filters.py
+++ b/devices/filters.py
@@ -1,14 +1,24 @@
 import django_filters
 from .models import Device
+from django.db.models import Q
 
 
 class DeviceFilter(django_filters.FilterSet):
     name = django_filters.CharFilter(lookup_expr="icontains")
     mac = django_filters.CharFilter(lookup_expr="icontains")
     vendor = django_filters.CharFilter(lookup_expr="icontains")
-    user = django_filters.CharFilter(
-        field_name="user__last_name", lookup_expr="icontains"
-    )
+    user = django_filters.CharFilter(method="filter_user_search")
+
+    def filter_user_search(self, queryset, name, value):
+        """
+        Search across multiple user fields: first_name, last_name, id_card, mobile
+        """
+        return queryset.filter(
+            Q(user__first_name__icontains=value)
+            | Q(user__last_name__icontains=value)
+            | Q(user__id_card__icontains=value)
+            | Q(user__mobile__icontains=value)
+        )
 
     class Meta:
         model = Device