diff --git a/lib/graphics.js b/lib/graphics.js
index aed4a1f..078aba3 100644
--- a/lib/graphics.js
+++ b/lib/graphics.js
@@ -51,7 +51,7 @@ const videoTypes = {
   '13': 'UDI embedded',
   '14': 'SDTVDONGLE',
   '15': 'MIRACAST',
-  '0x80000000': 'INTERNAL'
+  '2147483648': 'INTERNAL'
 };
 
 function graphics(callback) {
diff --git a/lib/wifi.js b/lib/wifi.js
index 55365a9..092a916 100644
--- a/lib/wifi.js
+++ b/lib/wifi.js
@@ -28,7 +28,8 @@ function wifiDBFromQuality(quality) {
 }
 
 function wifiQualityFromDB(db) {
-  return 2 * (parseFloat(db) + 100);
+  const result = 2 * (parseFloat(db) + 100);
+  return result <= 100 ? result : 100;
 }
 
 function wifiFrequencyFromChannel(channel) {