diff --git a/README.md b/README.md
index e8dfbbe..eb5084f 100644
--- a/README.md
+++ b/README.md
@@ -14,6 +14,13 @@ Audio I/O for real-time applications, like VoIP.
 - `aspew-in.py` takes a microphone as an input, and outputs it to pipe.
 - `aspew-out.py` takes input from a pipe, and outputs it to a speaker.
 
+## Flags
+Flags formatted as `-s` or `--long`.
+
+### in & out:
+- `-l`: List devices as JSON
+- `-h`: Use human-readable format
+
 ## Arguments
 Arguments are pairs of key=value.
 
@@ -32,4 +39,10 @@ Arguments are pairs of key=value.
 Listen to your default microphone at default settings.
 
 - `./aspew-in.py format=paInt16 bitrate=48000 channels=2 | ./aspew-out.py format=paInt16 bitrate=48000 channels=2`  
-Listen to your default microphone at 16-bit, 48000Hz, stereo.
\ No newline at end of file
+Listen to your default microphone at 16-bit, 48000Hz, stereo.
+
+- `./aspew-in.py -lh`
+List your input devices.
+
+- `./aspew-out.py -lh`
+List your output devices.
\ No newline at end of file
diff --git a/aspew-in.py b/aspew-in.py
index c8f1d90..d5677ce 100755
--- a/aspew-in.py
+++ b/aspew-in.py
@@ -5,6 +5,25 @@ import time
 import pyaudio
 unbufferedStdout = os.fdopen(sys.stdout.fileno(),"wb",0) # Make unbuffered stdout
 
+def parseFlags():
+	rtn = []
+	for arg in sys.argv[1:]:
+		arg = arg.replace(" ","")
+		arg = arg.replace("\t","")
+		arg = arg.replace("\r","")
+		arg = arg.replace("\n","")
+		if arg[0] != "-": continue
+		if arg == "-": continue
+		
+		if arg[:2] == "--":
+			rtn.append(arg[2:])
+			continue 
+		
+		for i in arg[1:]:
+			rtn.append(i)
+	
+	return rtn
+
 def parseSettings():
 	rtn = {}
 	for arg in sys.argv[1:]:
@@ -25,6 +44,34 @@ def streamHandler(in_data, frame_count, time_info, status):
 	unbufferedStdout.write(in_data)
 	return (in_data, pyaudio.paContinue)
 
+flags = parseFlags()
+
+if "l" in flags:
+	devices = {}
+	audio = pyaudio.PyAudio()
+	defaultDevice = audio.get_default_host_api_info()["defaultInputDevice"]
+	devices["default"] = defaultDevice
+	for i in range(0, audio.get_device_count()):
+		info = audio.get_device_info_by_index(i)
+		if info["maxInputChannels"] == 0: continue
+		
+		devices[i] = {
+			"name": info["name"],
+			"api": audio.get_host_api_info_by_index(info["hostApi"])["name"]
+		}
+	
+	if not "h" in flags:
+		import json
+		print(json.dumps(devices))
+	else:
+		print("\nAvailable input devices:")
+		for i in devices:
+			if i == "default": continue
+			st = str(i)+ ": " +devices[i]["name"]+ " [" +devices[i]["api"]+ "]"
+			if i == defaultDevice: st = st + " *"
+			print(st)
+	sys.exit(0)
+
 settings = parseSettings()
 audioFormat = getSetting(settings,str,["f","format"],"paUInt8")
 audioChannels = getSetting(settings,int,["c","channel","channels"],1)
diff --git a/aspew-out.py b/aspew-out.py
index e04ff86..50d741d 100755
--- a/aspew-out.py
+++ b/aspew-out.py
@@ -58,6 +58,25 @@ def streamHandler(in_data, frame_count, time_info, status):
 	data += getAudioFrame()
 	return (data, pyaudio.paContinue)
 
+def parseFlags():
+	rtn = []
+	for arg in sys.argv[1:]:
+		arg = arg.replace(" ","")
+		arg = arg.replace("\t","")
+		arg = arg.replace("\r","")
+		arg = arg.replace("\n","")
+		if arg[0] != "-": continue
+		if arg == "-": continue
+		
+		if arg[:2] == "--":
+			rtn.append(arg[2:])
+			continue 
+		
+		for i in arg[1:]:
+			rtn.append(i)
+	
+	return rtn
+
 def parseSettings():
 	rtn = {}
 	for arg in sys.argv[1:]:
@@ -74,6 +93,34 @@ def getSetting(lst,tp,keys,default = None):
 			return tp(lst[key])
 	return default
 
+flags = parseFlags()
+
+if "l" in flags:
+	devices = {}
+	audio = pyaudio.PyAudio()
+	defaultDevice = audio.get_default_host_api_info()["defaultOutputDevice"]
+	devices["default"] = defaultDevice
+	for i in range(0, audio.get_device_count()):
+		info = audio.get_device_info_by_index(i)
+		if info["maxOutputChannels"] == 0: continue
+		
+		devices[i] = {
+			"name": info["name"],
+			"api": audio.get_host_api_info_by_index(info["hostApi"])["name"]
+		}
+	
+	if not "h" in flags:
+		import json
+		print(json.dumps(devices))
+	else:
+		print("\nAvailable output devices:")
+		for i in devices:
+			if i == "default": continue
+			st = str(i)+ ": " +devices[i]["name"]+ " [" +devices[i]["api"]+ "]"
+			if i == defaultDevice: st = st + " *"
+			print(st)
+	sys.exit(0)
+
 settings = parseSettings()
 audioFormat = getSetting(settings,str,["f","format"],"paUInt8")
 audioChannels = getSetting(settings,int,["c","channel","channels"],1)