diff --git a/Aux/EventBuilder.cpp b/Aux/EventBuilder.cpp
index f572582..b3853b6 100644
--- a/Aux/EventBuilder.cpp
+++ b/Aux/EventBuilder.cpp
@@ -167,7 +167,7 @@ int main(int argc, char **argv) {
     }
     reader[i] = new FSUReader(fList, 600, debug);
     hitList[i] = reader[i]->ReadBatch(batchSize, debug );
-    reader[i]->PrintHitListInfo(hitList[i], "hitList-" + std::to_string(reader[i]->GetSN()));
+    reader[i]->PrintHitListInfo(&hitList[i], "hitList-" + std::to_string(reader[i]->GetSN()));
     ID[i] = 0;
     if( debug ) {
 
@@ -216,6 +216,7 @@ int main(int argc, char **argv) {
       //chekc if reached the end of hitList
       if( ID[ig] >= hitList[ig].size() ) {
         hitList[ig] = reader[ig]->ReadBatch(batchSize, debug + 1);
+        if( debug ) reader[ig]->PrintHitListInfo( &hitList[ig], "hitList-" + std::to_string(ig));
         ID[ig] = 0;
         if( hitList[ig].size() == 0 ) continue;
       }
@@ -234,6 +235,7 @@ int main(int argc, char **argv) {
           //check if reached the end of hitList
           if( ID[ig] >= hitList[ig].size() ) {
             hitList[ig] = reader[ig]->ReadBatch(batchSize, debug);
+            if( debug ) reader[ig]->PrintHitListInfo( &hitList[ig], "hitList-" + std::to_string(ig));
             ID[ig] = 0;
             if( hitList[ig].size() == 0 ) break;
           }
diff --git a/Aux/fsuReader.h b/Aux/fsuReader.h
index a45b545..67c6e8e 100644
--- a/Aux/fsuReader.h
+++ b/Aux/fsuReader.h
@@ -79,13 +79,14 @@ class FSUReader{
       }
     }
 
-    static void PrintHitListInfo(std::vector<Hit> hitList, std::string name){
-      size_t n = hitList.size();
+    static void PrintHitListInfo(std::vector<Hit> * hitList, std::string name){
+      size_t n = hitList->size();
       size_t s = sizeof(Hit);
       printf("============== %s, size : %zu | %.2f MByte\n", name.c_str(), n, n*s/1024./1024.);
       if( n > 0 ){
-        printf("t0 : %15llu \n", hitList.at(0).timestamp);
-        printf("t1 : %15llu \n", hitList.back().timestamp);
+        printf("t0 : %15llu ns\n", hitList->front().timestamp);
+        printf("t1 : %15llu ns\n", hitList->back().timestamp);
+        printf("dt : %15.3f ms\n", (hitList->back().timestamp - hitList->front().timestamp)/1e6);
       }
     }
 
@@ -94,8 +95,9 @@ class FSUReader{
       size_t s = sizeof(Hit);
       printf("============== reader.hit, size : %zu | %.2f MByte\n", n, n*s/1024./1024.);
       if( n > 0 ){
-        printf("t0 : %15llu \n", hit.at(0).timestamp);
-        printf("t1 : %15llu \n", hit.back().timestamp);
+        printf("t0 : %15llu ns\n", hit.at(0).timestamp);
+        printf("t1 : %15llu ns\n", hit.back().timestamp);
+        printf("dt : %15.3f ms\n", (hit.back().timestamp - hit.front().timestamp)/1e6);
       }
     }
 
@@ -472,8 +474,9 @@ inline std::vector<Hit> FSUReader::ReadBatch(unsigned int batchSize, bool verbos
     uLong t1_B = hit.back().timestamp;
     if( verbose ) {
       printf(" hit in memeory : %7zu | %u | %lu \n", hit.size(), filePos, inFileSize);
-      printf("t0 : %15lu\n", t0_B);
-      printf("t1 : %15lu\n", t1_B);
+      printf("t0 : %15lu ns\n", t0_B);
+      printf("t1 : %15lu ns\n", t1_B);
+      printf("dt : %15.3f ms\n", (t1_B - t0_B)/1e6);
     }
 
     hitList_A = hit;
@@ -500,6 +503,7 @@ inline std::vector<Hit> FSUReader::ReadBatch(unsigned int batchSize, bool verbos
     printf(" hit in memeory : %7zu | %u | %lu \n", hit.size(), filePos, inFileSize);
     printf("t0 : %15lu\n", t0_B);
     printf("t1 : %15lu\n", t1_B);
+    printf("dt : %15.3f ms\n", (t1_B - t0_B)/1e6);
   }
 
   uLong t0_A = hitList_A.at(0).timestamp;
@@ -552,8 +556,8 @@ inline std::vector<Hit> FSUReader::ReadBatch(unsigned int batchSize, bool verbos
     if( verbose ) {
       printf("----------------- ID_A : %lu, Drop\n", ID_A);
       printf("----------------- ID_B : %lu, Drop\n", ID_B);
-      PrintHitListInfo(hitList_A, "hitList_A");
-      PrintHitListInfo(hitTemp, "hitTemp");
+      PrintHitListInfo(&hitList_A, "hitList_A");
+      PrintHitListInfo(&hitTemp, "hitTemp");
       PrintHitListInfo();
       printf("=========== sume of A + B + Temp : %zu \n", hitList_A.size() + hit.size()  + hitTemp.size());
       printf("----------------- refill hitList_A \n");
@@ -565,7 +569,7 @@ inline std::vector<Hit> FSUReader::ReadBatch(unsigned int batchSize, bool verbos
     hitTemp.clear();
     
     if( verbose ) {
-      PrintHitListInfo(hitList_A, "hitList_A");
+      PrintHitListInfo(&hitList_A, "hitList_A");
       PrintHitListInfo();
       printf("=========== sume of A + B : %zu \n", hitList_A.size() + hit.size());
     }
diff --git a/FSUDAQ.cpp b/FSUDAQ.cpp
index feb768b..5dd9619 100644
--- a/FSUDAQ.cpp
+++ b/FSUDAQ.cpp
@@ -55,7 +55,7 @@ MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent){
 
     cbOpenDigitizers = new RComboBox(this);
     cbOpenDigitizers->addItem("Open Digitizers ... ", 0);
-    cbOpenDigitizers->addItem("Open Digitizers via Optical", 1);
+    cbOpenDigitizers->addItem("Open Digitizers via Optical/USB", 1);
     // cbOpenDigitizers->addItem("Open Digitizers (default program)", 2);
     // cbOpenDigitizers->addItem("Open Digitizers + load Settings", 3);
     //cbOpenDigitizers->addItem("Open Digitizers via USB", 3);
@@ -1679,9 +1679,9 @@ void MainWindow::WriteRunTimestamp(bool isStartRun){
   if( file.open(QIODevice::Text | QIODevice::WriteOnly | QIODevice::Append) ){
 
     if( isStartRun ){
-      file.write(("Start Run | " + QString::number(runID) + " | " + dateTime + " | " + startComment + "\n").toStdString().c_str());
+      file.write(("Start Run | " + QString::number(runID) + " | " + dateTime + " | " + lePrefix->text() + " | " + startComment + "\n").toStdString().c_str());
     }else{
-      file.write((" Stop Run | " + QString::number(runID) + " | " + dateTime + " | " + stopComment + "\n").toStdString().c_str());
+      file.write((" Stop Run | " + QString::number(runID) + " | " + dateTime + " | " + lePrefix->text() + " | " + stopComment + "\n").toStdString().c_str());
     }
     
     file.close();
diff --git a/README.md b/README.md
index 9dd2f42..8fe1edb 100644
--- a/README.md
+++ b/README.md
@@ -77,6 +77,7 @@ Ubuntu 22.04
 - CAENCOmm v1.5.3 +
 - CAENDigitizer v2.17.1 +
 - CAEN A3818 Driver v1.6.8 +
+- CAENUSBdrv v1.5.5 + (for V57XX digitizer with USB connection)
 
 - qt6-base-dev
 - libqt6charts6-dec