diff --git a/CHANGELOG.md b/CHANGELOG.md
index 18d0423..57189a4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,9 @@
+## [1.8.0]
+
+* More detailed synchronization status and send changes progress.
+   * Added enum `SyncDataState` with detailed data synchronization status.
+   * Added `SyncStateInfo.dataInfo` getter.
+
 ## [1.7.0]
 
 * Added enum `SyncFilesState` with possible file synchronization statuses.
diff --git a/lib/in_sync_interface.dart b/lib/in_sync_interface.dart
index e4a6617..252a5e5 100644
--- a/lib/in_sync_interface.dart
+++ b/lib/in_sync_interface.dart
@@ -1,2 +1,3 @@
+export 'src/sync_data_info.dart';
 export 'src/sync_repository.dart';
 export 'src/sync_state_info.dart';
diff --git a/lib/src/sync_data_info.dart b/lib/src/sync_data_info.dart
new file mode 100644
index 0000000..f40e283
--- /dev/null
+++ b/lib/src/sync_data_info.dart
@@ -0,0 +1,14 @@
+/// Data synchronization information.
+abstract class SyncDataInfo {
+  SyncDataState? get state;
+  double? get sendChangesProgress;
+}
+
+/// Sync data status.
+enum SyncDataState {
+  /// Synchronization at the data sending stage.
+  sendChanges,
+
+  /// Synchronization at the get entities stage.
+  getEntities,
+}
diff --git a/lib/src/sync_state_info.dart b/lib/src/sync_state_info.dart
index cfbef28..2394742 100644
--- a/lib/src/sync_state_info.dart
+++ b/lib/src/sync_state_info.dart
@@ -1,7 +1,10 @@
+import 'package:in_sync_interface/in_sync_interface.dart';
+
 /// Synchronization status information, including errors.
 abstract class SyncStateInfo {
   SyncState get state;
   SyncFilesState get syncFilesState;
+  SyncDataInfo get dataInfo;
   SyncError? get syncError;
   Object? get errorData;
 
diff --git a/pubspec.yaml b/pubspec.yaml
index d7eb7b4..166c123 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,6 +1,6 @@
 name: in_sync_interface
 description: An interface for synchronization functional. Used by in_sync.
-version: 1.7.0
+version: 1.8.0
 homepage: https://github.com/innim/
 repository: https://github.com/Innim/in_sync_interface
 issue_tracker: https://github.com/Innim/in_sync_interface/issues