diff --git a/lib/BleFingerprint/BleFingerprint.cpp b/lib/BleFingerprint/BleFingerprint.cpp
index 8cd96ad..5042631 100644
--- a/lib/BleFingerprint/BleFingerprint.cpp
+++ b/lib/BleFingerprint/BleFingerprint.cpp
@@ -391,8 +391,8 @@ void BleFingerprint::fingerprintManufactureData(NimBLEAdvertisedDevice *advertis
             {
                 BLEBeacon oBeacon = BLEBeacon();
                 oBeacon.setData(strManufacturerData);
-                setId(Sprintf("iBeacon:%s-%u-%u", std::string(oBeacon.getProximityUUID()).c_str(), ENDIAN_CHANGE_U16(oBeacon.getMajor()), ENDIAN_CHANGE_U16(oBeacon.getMinor())), ID_TYPE_IBEACON);
                 calRssi = oBeacon.getSignalPower();
+                setId(Sprintf("iBeacon:%s-%u-%u", std::string(oBeacon.getProximityUUID()).c_str(), ENDIAN_CHANGE_U16(oBeacon.getMajor()), ENDIAN_CHANGE_U16(oBeacon.getMinor())), calRssi != 3 ? ID_TYPE_IBEACON : ID_TYPE_ECHO_LOST );
             }
             else if (strManufacturerData.length() >= 4 && strManufacturerData[2] == 0x10)
             {
diff --git a/lib/BleFingerprint/BleFingerprint.h b/lib/BleFingerprint/BleFingerprint.h
index 9279e2d..0cbcbed 100644
--- a/lib/BleFingerprint/BleFingerprint.h
+++ b/lib/BleFingerprint/BleFingerprint.h
@@ -15,6 +15,8 @@
 #define NO_RSSI (-32768)
 
 #define ID_TYPE_TX_POW short(1)
+
+#define ID_TYPE_ECHO_LOST short(-10)
 #define ID_TYPE_MISC_APPLE short(-5)
 
 #define ID_TYPE_MAC short(0)