diff --git a/usecase/device_details.go b/usecase/device_details.go
index b34f4c5..8ee41ae 100644
--- a/usecase/device_details.go
+++ b/usecase/device_details.go
@@ -3,6 +3,7 @@ package usecase
 import (
 	"errors"
 	"fmt"
+	"log"
 	"mime/multipart"
 	"strings"
 	"time"
@@ -55,18 +56,23 @@ func NewDeviceDetailsUseCase(deviceDetailsRepo repository.DeviceDetailsRepo, geo
 }
 
 func (u *deviceDetailsUseCase) GetDevicesWithoutConnections(deviceTypes []string) ([]res.DeviceDetailsResponse, error) {
-    // Validate device types
-    validTypes := map[string]bool{"closure": true, "OTB": true}
-    for _, deviceType := range deviceTypes {
-        if !validTypes[deviceType] {
-            return nil, fmt.Errorf("invalid device type: %s. Only closure and OTB are allowed", deviceType)
+    // Validate device types and convert to uppercase
+    validTypes := map[string]bool{"CLOSURE": true, "OTB": true}
+    for i, deviceType := range deviceTypes {
+        upperDeviceType := strings.ToUpper(deviceType)
+        if !validTypes[upperDeviceType] {
+            return nil, fmt.Errorf("invalid device type: %s. Only CLOSURE and OTB are allowed", deviceType)
         }
+        // Replace the original value in the slice with uppercase version for consistency
+        deviceTypes[i] = upperDeviceType
     }
     
     // If no device types provided, default to closure and OTB
     if len(deviceTypes) == 0 {
-        deviceTypes = []string{"closure", "OTB"}
+        deviceTypes = []string{"CLOSURE", "OTB"}
     }
+
+    log.Printf("Fetching devices without connections for types: %v", deviceTypes)
     
     devices, err := u.deviceDetailsRepo.GetDevicesWithoutConnections(deviceTypes)
     if err != nil {