diff --git a/action_check_exists.go b/action_check_exists.go
new file mode 100644
index 0000000..14ae682
--- /dev/null
+++ b/action_check_exists.go
@@ -0,0 +1,24 @@
+package devicemngmt
+
+import (
+	"context"
+
+	"github.com/Selly-Modules/logger"
+	"go.mongodb.org/mongo-driver/bson"
+)
+
+func (s Service) IsDeviceIDExisted(ctx context.Context, deviceID string) bool {
+	var (
+		col    = s.getDeviceCollection()
+		device = Device{}
+	)
+
+	if err := col.FindOne(ctx, bson.M{"deviceId": deviceID}).Decode(&device); err != nil {
+		logger.Error("devicemngmt - findByDeviceID", logger.LogData{
+			"deviceId": deviceID,
+			"err":      err.Error(),
+		})
+		return true
+	}
+	return !device.ID.IsZero()
+}
diff --git a/action_create.go b/action_create.go
index 8f53290..79a9663 100644
--- a/action_create.go
+++ b/action_create.go
@@ -40,7 +40,7 @@ func (s Service) Create(payload CreateOptions) error {
 	deviceData := payload.newDevice()
 
 	// Find deviceID existed or not
-	if s.isDeviceIDExisted(ctx, deviceData.DeviceID) {
+	if s.IsDeviceIDExisted(ctx, deviceData.DeviceID) {
 		return errors.New("this device is already existed")
 	}
 
diff --git a/db.go b/db.go
index 5aae623..865ecb1 100644
--- a/db.go
+++ b/db.go
@@ -1,11 +1,8 @@
 package devicemngmt
 
 import (
-	"context"
 	"fmt"
 
-	"github.com/Selly-Modules/logger"
-	"go.mongodb.org/mongo-driver/bson"
 	"go.mongodb.org/mongo-driver/mongo"
 )
 
@@ -16,19 +13,3 @@ func (s Service) getDeviceCollection() *mongo.Collection {
 	}
 	return s.DB.Collection(tableDevice)
 }
-
-func (s Service) isDeviceIDExisted(ctx context.Context, deviceID string) bool {
-	var (
-		col    = s.getDeviceCollection()
-		device = Device{}
-	)
-
-	if err := col.FindOne(ctx, bson.M{"deviceId": deviceID}).Decode(&device); err != nil {
-		logger.Error("devicemngmt - findByDeviceID", logger.LogData{
-			"deviceId": deviceID,
-			"err":      err.Error(),
-		})
-		return true
-	}
-	return !device.ID.IsZero()
-}