diff --git a/README.md b/README.md
index bbf30d6..c12cdd9 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,7 @@ English | [Deutsch](./readme.i18n/README.de_DE.md) | [简体中文](./readme.i18
 
 # Cat-Printer
 
-🐱🖨 A project that provides support to some Bluetooth "Cat Printer" models, on *many* platforms!
+🐱🖨 A project that provides support to some Bluetooth “Cat Printer” models, on *many* platforms!
 
 [![cat-printer-poster](https://repository-images.githubusercontent.com/403563361/93e32942-856c-4552-a8b0-b03c0976a3a7)](https://repository-images.githubusercontent.com/403563361/93e32942-856c-4552-a8b0-b03c0976a3a7)
 
@@ -45,7 +45,7 @@ It may work!
   - and also Android!
 
 - Free, as in [freedom](https://www.gnu.org/philosophy/free-sw.html)!
-  - Unlike those proprietary "apps" around,  
+  - Unlike those proprietary “apps” around,  
     this project is for everyone that concerns *open-mind and freedom*!
 
 - and Fun!
@@ -64,20 +64,20 @@ Recommend to set scan time to 1 second.
 
 ### Windows
 
-Get the newest release archive with "windows" in the file name,  
+Get the newest release archive with “windows” in the file name,  
 extract to somewhere and run `start.bat`
 
 Windows typically needs longer scan time. Defaults to 4 seconds, try to find your case.
 
 ### GNU/Linux
 
-You can get the "pure" release, extract it, fire up a terminal and run:  
+You can get the “pure” release, extract it, fire up a terminal and run:  
 ```bash
 python3 server.py
 ```
 
 It is recommended to set the scan time to 2 seconds.
-On Arch Linux based distros you may first install `bluez`, as it may not be installled by default
+On Arch Linux based distros you may install `bluez` first, as it may not be installed by default
 ```bash
 sudo pacman -S bluez bluez-utils
 ```
@@ -92,7 +92,7 @@ then install `pyobjc` and `bleak` via `pip` in terminal:
 pip3 install pyobjc bleak
 ```
 
-After that, fetch & use a "bare" release:  
+After that, fetch & use a “bare” release:  
 ```bash
 python3 server.py
 ```
@@ -102,8 +102,8 @@ Currently the web browser will not open automatically in MacOS. Please run manua
 ### Worth to Note
 
 For all supported platforms,  
-You can also use "pure" edition once you have [Python 3](https://www.python.org/) installed,  
-or "bare" edition if you also managed to install `bleak` via `pip`.
+You can also use “pure” edition once you have [Python 3](https://www.python.org/) installed,  
+or “bare” edition if you also managed to install `bleak` via `pip`.
 
 If you like command-line, installing [ImageMagick](https://imagemagick.org/) and [Ghostscript](https://ghostscript.com/) could be very helpful.
 
@@ -111,7 +111,7 @@ See the [releases](https://github.com/NaitLee/Cat-Printer/releases) now!
 
 ## Problems?
 
-Please use Issue or Discussion if there's something in your mind!
+Please use Issue or Discussion if there’s something in your mind!
 
 Of course Pull Requests are welcome if you can handle them!
 
@@ -148,7 +148,7 @@ After that, give yourself a credit in `www/about.html`, if you prefer.
 - [Bleak](https://bleak.readthedocs.io/en/latest/) Bluetooth-Low-Energy library! The overall Hero!
 - [roddeh-i18n](https://github.com/roddeh/i18njs), the current built-in i18n is inspired by this
 - [PF2 font](http://grub.gibibit.com/New_font_format), great minimal raster font idea
-- ImageMagick & Ghostscript, never mention other if something useful is already in one's system
+- ImageMagick & Ghostscript, never mention other if something useful is already in one’s system
 - [python-for-android](https://python-for-android.readthedocs.io/en/latest/), though there are some painful troubles
 - [AdvancedWebView](https://github.com/delight-im/Android-AdvancedWebView) for saving my life from Java
 - Stack Overflow & the whole Internet, you let me know Android `Activity` all from beginning
diff --git a/printer.py b/printer.py
index 136aba6..56e653d 100644
--- a/printer.py
+++ b/printer.py
@@ -285,7 +285,8 @@ class PrinterDriver(Commander):
     font_scale: int = 1
 
     energy: int = None
-    quality: int = 24
+    'Thermal strength of printer, range 0x0000 to 0xffff'
+    speed: int = 32
 
     mtu: int = 200
 
@@ -445,10 +446,10 @@ class PrinterDriver(Commander):
         else:
             self.start_printing()
         self.set_dpi_as_200()
-        if self.quality:    # well, slower makes stable heating
-            self.set_speed(self.quality)
+        if self.speed:    # well, slower makes stable heating
+            self.set_speed(self.speed)
         if self.energy is not None:
-            self.set_energy(self.energy * 0x100)
+            self.set_energy(self.energy)
         self.apply_energy()
         self.update_device()
         self.flush()
@@ -656,13 +657,13 @@ def _main():
     printer.scan_time = float(scan_param[0])
     identifier = ','.join(scan_param[1:])
     if args.energy is not None:
-        printer.energy = int(args.energy * 0xff)
+        printer.energy = int(args.energy * 0xffff)
     elif args.convert == 'text' or args.text:
         printer.energy = 96
     else:
         printer.energy = 64
     if args.quality is not None:
-        printer.quality = 4 * (args.quality + 5)
+        printer.speed = 4 * (args.quality + 5)
 
     image_param = args.image.split(',')
     if 'flip' in image_param:
diff --git a/printer_lib/commander.py b/printer_lib/commander.py
index 27f26e4..6604707 100644
--- a/printer_lib/commander.py
+++ b/printer_lib/commander.py
@@ -130,8 +130,9 @@ class Commander(metaclass=ABCMeta):
 
     def set_speed(self, value: int):
         ''' Set how quick to feed/retract paper. **The lower, the quicker.**
-            My test shows that, a value below 4 would make printer
-            unable to feed/retract, for it's way too quick.
+            My printer with value < 4 set would make it unable to feed/retract,
+            maybe it's way too quick.
+            Speed also affects the quality, for heat time/stability reasons.
         '''
         self.send( self.make_command(0xbd, int_to_bytes(value)) )
 
diff --git a/server.py b/server.py
index b10030b..9f4fa11 100644
--- a/server.py
+++ b/server.py
@@ -78,7 +78,8 @@ class PrinterServerHandler(BaseHTTPRequestHandler):
         'is_android': False,
         'scan_time': 4.0,
         'dry_run': False,
-        'energy': 64
+        'energy': 64,
+        'quality': 32
     })
     _settings_blacklist = (
         'printer', 'is_android'
@@ -198,9 +199,9 @@ class PrinterServerHandler(BaseHTTPRequestHandler):
         self.printer.fake = self.settings.fake
         self.printer.dump = self.settings.dump
         if self.settings.energy is not None:
-            self.printer.energy = int(self.settings.energy)
+            self.printer.energy = int(self.settings.energy) * 0x100
         if self.settings.quality is not None:
-            self.printer.quality = int(self.settings.quality)
+            self.printer.speed = int(self.settings.quality)
         self.printer.flip_h = self.settings.flip_h or self.settings.flip
         self.printer.flip_v = self.settings.flip_v or self.settings.flip
         self.printer.rtl = self.settings.force_rtl