diff --git a/8By8/8By8.ino b/8By8/8By8.ino
index f35c267..159d7de 100644
--- a/8By8/8By8.ino
+++ b/8By8/8By8.ino
@@ -20,7 +20,7 @@
 #define MAG_UPDATE 0x08
 #define READ_UPDATE 0x80
 
-#define DEBUG true
+#define DEBUG false
 #define TRACE false
 
 // 3 width, 4 height
@@ -166,6 +166,11 @@ public:
             }
         }
 
+        if (WitSetBandwidth(BANDWIDTH_256HZ) != WIT_HAL_OK) {
+            Serial.println("Set Bandwidth Error");
+            return false;
+        }
+
         if (WitSetContent(RSW_ANGLE | RSW_ACC | RSW_GYRO) != WIT_HAL_OK) {
             Serial.println("Set send content: angle, acc, and GYRO Error");
             return false;
@@ -1220,7 +1225,8 @@ void words() {
     }
     else {
         Serial.print(display_string[next_char_ptr]);
-        Cube::draw_letter(0, 7, 7, display_string[next_char_ptr] - '0' + 26, 2, 3);
+        Cube::draw_letter(0, 7, 7, display_string[next_char_ptr] - '0' + 26, 2,
+                          3);
     }
 
     next_char_ptr++;
@@ -1303,8 +1309,8 @@ void calculate_and_draw() {
         if (SensorReader::angle.z - z_ref > 40.0) {
             if (DEBUG) {
                 Serial.println(SensorReader::angle.z);
-                Serial.println("e");
             }
+            Serial.println("Zoom out");
             zoom /= 2.0;
             need_reevaluate = true;
             waiting_for_command = false;
@@ -1312,8 +1318,8 @@ void calculate_and_draw() {
         else if (SensorReader::angle.z - z_ref < -40.0) {
             if (DEBUG) {
                 Serial.println(SensorReader::angle.z);
-                Serial.println("f");
             }
+            Serial.println("Zoom in");
             zoom *= 2.0;
             need_reevaluate = true;
             waiting_for_command = false;