diff --git a/css/tooltip.css b/css/tooltip.css
new file mode 100644
index 0000000..dd3c524
--- /dev/null
+++ b/css/tooltip.css
@@ -0,0 +1,46 @@
+/* Tooltip container */
+.tooltip2 {
+    position: relative;
+    display: inline-block;
+    border-bottom: 1px dotted black; /* If you want dots under the hoverable text */
+}
+
+/* Tooltip text */
+.tooltip2 .tooltip2text {
+    visibility: hidden;
+    width: 120px;
+    background-color: #555;
+    color: #fff;
+    text-align: center;
+    padding: 5px 0;
+    border-radius: 6px;
+
+    /* Position the tooltip text */
+    position: absolute;
+    z-index: 1;
+    bottom: 125%;
+    left: 50%;
+    margin-left: -60px;
+
+    /* Fade in tooltip */
+    opacity: 0;
+    transition: opacity 1s;
+}
+
+/* Tooltip arrow */
+.tooltip2 .tooltip2text::after {
+    content: "";
+    position: absolute;
+    top: 100%;
+    left: 50%;
+    margin-left: -5px;
+    border-width: 5px;
+    border-style: solid;
+    border-color: #555 transparent transparent transparent;
+}
+
+/* Show the tooltip text when you mouse over the tooltip container */
+.tooltip2:hover .tooltip2text {
+    visibility: visible;
+    opacity: 1;
+}
diff --git a/include/functions.php b/include/functions.php
index a42d8e4..85f8f54 100644
--- a/include/functions.php
+++ b/include/functions.php
@@ -258,20 +258,20 @@ function getHeardList($logLines, $onlyLast) {
 				if (substr($ber, 6) != "-0/-0/-0 dBm") {
 					$rssiString = substr($ber, 6);
 					$rssiAvg = preg_replace('/-\d+\/-\d+\/(-\d+) dBm/', "\\1", $rssiString);
-					if ($rssiAvg > "-53") $rssi = "<img src=\"images/4.png\" \> S9+40dB ($rssiAvg dBm)";
-					else if ($rssiAvg > "-63") $rssi = "<img src=\"images/4.png\" \> S9+30dB ($rssiAvg dBm)";
-					else if ($rssiAvg > "-73") $rssi = "<img src=\"images/4.png\" \> S9+20dB ($rssiAvg dBm)";
-					else if ($rssiAvg > "-83") $rssi = "<img src=\"images/4.png\" \> S9+10dB ($rssiAvg dBm)";
-					else if ($rssiAvg > "-93") $rssi = "<img src=\"images/4.png\" \> S9 ($rssiAvg dBm)";
-					else if ($rssiAvg > "-99") $rssi = "<img src=\"images/3.png\" \> S8 ($rssiAvg dBm)";
-					else if ($rssiAvg > "-105") $rssi = "<img src=\"images/3.png\" \> S7 ($rssiAvg dBm)";
-					else if ($rssiAvg > "-111") $rssi = "<img src=\"images/2.png\" \> S6 ($rssiAvg dBm)";
-					else if ($rssiAvg > "-117") $rssi = "<img src=\"images/2.png\" \> S5 ($rssiAvg dBm)";
-					else if ($rssiAvg > "-123") $rssi = "<img src=\"images/1.png\" \> S4 ($rssiAvg dBm)";
-					else if ($rssiAvg > "-129") $rssi = "<img src=\"images/1.png\" \> S3 ($rssiAvg dBm)";
-					else if ($rssiAvg > "-135") $rssi = "<img src=\"images/0.png\" \> S2 ($rssiAvg dBm)";
-					else if ($rssiAvg > "-141") $rssi = "<img src=\"images/0.png\" \> S1 ($rssiAvg dBm)";
-					else $rssi = "<img src=\"images/0.png\" \> S0 ($rssiAvg dBm)";
+					if ($rssiAvg > "-53") $rssi = "<img src=\"images/4.png\" \> <div class=\"tooltip2\">S9+40dB ($rssiAvg dBm)<span class=\"tooltip2text\">$rssiString</span></div>";
+					else if ($rssiAvg > "-63") $rssi = "<img src=\"images/4.png\" \> <div class=\"tooltip2\">S9+30dB ($rssiAvg dBm)<span class=\"tooltip2text\">$rssiString</span></div>";
+					else if ($rssiAvg > "-73") $rssi = "<img src=\"images/4.png\" \> <div class=\"tooltip2\">S9+20dB ($rssiAvg dBm)<span class=\"tooltip2text\">$rssiString</span></div>";
+					else if ($rssiAvg > "-83") $rssi = "<img src=\"images/4.png\" \> <div class=\"tooltip2\">S9+10dB ($rssiAvg dBm)<span class=\"tooltip2text\">$rssiString</span></div>";
+					else if ($rssiAvg > "-93") $rssi = "<img src=\"images/4.png\" \> <div class=\"tooltip2\">S9 ($rssiAvg dBm)<span class=\"tooltip2text\">$rssiString</span></div>";
+					else if ($rssiAvg > "-99") $rssi = "<img src=\"images/3.png\" \> <div class=\"tooltip2\">S8 ($rssiAvg dBm)<span class=\"tooltip2text\">$rssiString</span></div>";
+					else if ($rssiAvg > "-105") $rssi = "<img src=\"images/3.png\" \> <div class=\"tooltip2\">S7 ($rssiAvg dBm)<span class=\"tooltip2text\">$rssiString</span></div>";
+					else if ($rssiAvg > "-111") $rssi = "<img src=\"images/2.png\" \> <div class=\"tooltip2\">S6 ($rssiAvg dBm)<span class=\"tooltip2text\">$rssiString</span></div>";
+					else if ($rssiAvg > "-117") $rssi = "<img src=\"images/2.png\" \> <div class=\"tooltip2\">S5 ($rssiAvg dBm)<span class=\"tooltip2text\">$rssiString</span></div>";
+					else if ($rssiAvg > "-123") $rssi = "<img src=\"images/1.png\" \> <div class=\"tooltip2\">S4 ($rssiAvg dBm)<span class=\"tooltip2text\">$rssiString</span></div>";
+					else if ($rssiAvg > "-129") $rssi = "<img src=\"images/1.png\" \> <div class=\"tooltip2\">S3 ($rssiAvg dBm)<span class=\"tooltip2text\">$rssiString</span></div>";
+					else if ($rssiAvg > "-135") $rssi = "<img src=\"images/0.png\" \> <div class=\"tooltip2\">S2 ($rssiAvg dBm)<span class=\"tooltip2text\">$rssiString</span></div>";
+					else if ($rssiAvg > "-141") $rssi = "<img src=\"images/0.png\" \> <div class=\"tooltip2\">S1 ($rssiAvg dBm)<span class=\"tooltip2text\">$rssiString</span></div>";
+					else $rssi = "<img src=\"images/0.png\" \> <div class=\"tooltip2\">S0 ($rssiAvg dBm)<span class=\"tooltip2text\">$rssiString</span></div>";
 				}
 				$ber = substr($loss, 5);
 				$loss = "";
@@ -283,20 +283,20 @@ function getHeardList($logLines, $onlyLast) {
 				if (array_key_exists(5,$lineTokens) && substr($lineTokens[5], 6) != "-0/-0/-0 dBm") {
 					$rssiString = substr($lineTokens[5], 6);
 					$rssiAvg = preg_replace('/-\d+\/-\d+\/(-\d+) dBm/', "\\1", $rssiString);
-					if ($rssiAvg > "-53") $rssi = "<img src=\"images/4.png\" \> S9+40dB ($rssiAvg dBm)";
-					else if ($rssiAvg > "-63") $rssi = "<img src=\"images/4.png\" \> S9+30dB ($rssiAvg dBm)";
-					else if ($rssiAvg > "-73") $rssi = "<img src=\"images/4.png\" \> S9+20dB ($rssiAvg dBm)";
-					else if ($rssiAvg > "-83") $rssi = "<img src=\"images/4.png\" \> S9+10dB ($rssiAvg dBm)";
-					else if ($rssiAvg > "-93") $rssi = "<img src=\"images/4.png\" \> S9 ($rssiAvg dBm)";
-					else if ($rssiAvg > "-99") $rssi = "<img src=\"images/3.png\" \> S8 ($rssiAvg dBm)";
-					else if ($rssiAvg > "-105") $rssi = "<img src=\"images/3.png\" \> S7 ($rssiAvg dBm)";
-					else if ($rssiAvg > "-111") $rssi = "<img src=\"images/2.png\" \> S6 ($rssiAvg dBm)";
-					else if ($rssiAvg > "-117") $rssi = "<img src=\"images/2.png\" \> S5 ($rssiAvg dBm)";
-					else if ($rssiAvg > "-123") $rssi = "<img src=\"images/1.png\" \> S4 ($rssiAvg dBm)";
-					else if ($rssiAvg > "-129") $rssi = "<img src=\"images/1.png\" \> S3 ($rssiAvg dBm)";
-					else if ($rssiAvg > "-135") $rssi = "<img src=\"images/0.png\" \> S2 ($rssiAvg dBm)";
-					else if ($rssiAvg > "-141") $rssi = "<img src=\"images/0.png\" \> S1 ($rssiAvg dBm)";
-					else $rssi = "<img src=\"images/0.png\" \> S0 ($rssiAvg dBm)";
+					if ($rssiAvg > "-53") $rssi = "<img src=\"images/4.png\" \> <div class=\"tooltip2\">S9+40dB ($rssiAvg dBm)<span class=\"tooltip2text\">$rssiString</span></div>";
+					else if ($rssiAvg > "-63") $rssi = "<img src=\"images/4.png\" \> <div class=\"tooltip2\">S9+30dB ($rssiAvg dBm)<span class=\"tooltip2text\">$rssiString</span></div>";
+					else if ($rssiAvg > "-73") $rssi = "<img src=\"images/4.png\" \> <div class=\"tooltip2\">S9+20dB ($rssiAvg dBm)<span class=\"tooltip2text\">$rssiString</span></div>";
+					else if ($rssiAvg > "-83") $rssi = "<img src=\"images/4.png\" \> <div class=\"tooltip2\">S9+10dB ($rssiAvg dBm)<span class=\"tooltip2text\">$rssiString</span></div>";
+					else if ($rssiAvg > "-93") $rssi = "<img src=\"images/4.png\" \> <div class=\"tooltip2\">S9 ($rssiAvg dBm)<span class=\"tooltip2text\">$rssiString</span></div>";
+					else if ($rssiAvg > "-99") $rssi = "<img src=\"images/3.png\" \> <div class=\"tooltip2\">S8 ($rssiAvg dBm)<span class=\"tooltip2text\">$rssiString</span></div>";
+					else if ($rssiAvg > "-105") $rssi = "<img src=\"images/3.png\" \> <div class=\"tooltip2\">S7 ($rssiAvg dBm)<span class=\"tooltip2text\">$rssiString</span></div>";
+					else if ($rssiAvg > "-111") $rssi = "<img src=\"images/2.png\" \> <div class=\"tooltip2\">S6 ($rssiAvg dBm)<span class=\"tooltip2text\">$rssiString</span></div>";
+					else if ($rssiAvg > "-117") $rssi = "<img src=\"images/2.png\" \> <div class=\"tooltip2\">S5 ($rssiAvg dBm)<span class=\"tooltip2text\">$rssiString</span></div>";
+					else if ($rssiAvg > "-123") $rssi = "<img src=\"images/1.png\" \> <div class=\"tooltip2\">S4 ($rssiAvg dBm)<span class=\"tooltip2text\">$rssiString</span></div>";
+					else if ($rssiAvg > "-129") $rssi = "<img src=\"images/1.png\" \> <div class=\"tooltip2\">S3 ($rssiAvg dBm)<span class=\"tooltip2text\">$rssiString</span></div>";
+					else if ($rssiAvg > "-135") $rssi = "<img src=\"images/0.png\" \> <div class=\"tooltip2\">S2 ($rssiAvg dBm)<span class=\"tooltip2text\">$rssiString</span></div>";
+					else if ($rssiAvg > "-141") $rssi = "<img src=\"images/0.png\" \> <div class=\"tooltip2\">S1 ($rssiAvg dBm)<span class=\"tooltip2text\">$rssiString</span></div>";
+					else $rssi = "<img src=\"images/0.png\" \> <div class=\"tooltip2\">S0 ($rssiAvg dBm)<span class=\"tooltip2text\">$rssiString</span></div>";
 				}
 			}
 
diff --git a/index.php b/index.php
index 676095c..ee11922 100644
--- a/index.php
+++ b/index.php
@@ -21,6 +21,8 @@ include "version.php";
   <head>
     <meta charset="utf-8">
      <meta name="viewport" content="width=device-width, initial-scale=0.6,maximum-scale=1, user-scalable=yes">
+    <!-- CSS for tooltip display -->
+    <link rel="stylesheet" href="css/tooltip.css">
     <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.3/jquery.min.js"></script>
     <!-- Das neueste kompilierte und minimierte CSS -->
     <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/latest/css/bootstrap.min.css">