diff --git a/app/src/main/cpp/PhoneDevice.cpp b/app/src/main/cpp/PhoneDevice.cpp
index 4452ef9b..2f22a189 100644
--- a/app/src/main/cpp/PhoneDevice.cpp
+++ b/app/src/main/cpp/PhoneDevice.cpp
@@ -422,7 +422,19 @@ bool CPhoneDevice::QuerySystemProperties(std::map<std::string, std::string>& pro
         }
         else if (it->first == (PROP_CHARGING_BUS_VOL))
         {
-            it->second = std::to_string(GpioControl::getChargingBusVoltage());
+            double val = -1;
+            char str[32] = { 0 };
+            for (int idx = 0; idx < 3; idx++)
+            {
+                val = GpioControl::getChargingBusVoltage();
+                if (val < 0)
+                {
+                    continue;
+                }
+                snprintf(str, sizeof(str), "%.1f", (val / 1000.0));
+                it->second = str;
+                break;
+            }
         }
         else if (it->first == (PROP_BATTERY_VOLTAGE))
         {