diff --git a/lib/audio.js b/lib/audio.js
new file mode 100644
index 0000000..f6cc628
--- /dev/null
+++ b/lib/audio.js
@@ -0,0 +1,235 @@
+'use strict';
+// @ts-check
+// ==================================================================================
+// audio.js
+// ----------------------------------------------------------------------------------
+// Description:   System Information - library
+//                for Node.js
+// Copyright:     (c) 2014 - 2021
+// Author:        Sebastian Hildebrandt
+// ----------------------------------------------------------------------------------
+// License:       MIT
+// ==================================================================================
+// 16. audio
+// ----------------------------------------------------------------------------------
+
+const exec = require('child_process').exec;
+// const execSync = require('child_process').execSync;
+const util = require('./util');
+// const fs = require('fs');
+
+let _platform = process.platform;
+
+const _linux = (_platform === 'linux');
+const _darwin = (_platform === 'darwin');
+const _windows = (_platform === 'win32');
+const _freebsd = (_platform === 'freebsd');
+const _openbsd = (_platform === 'openbsd');
+const _netbsd = (_platform === 'netbsd');
+const _sunos = (_platform === 'sunos');
+
+const winPrinterStatus = {
+  1: 'Other',
+  2: 'Unknown',
+  3: 'Idle',
+  4: 'Printing',
+  5: 'Warmup',
+  6: 'Stopped Printing',
+  7: 'Offline',
+}
+
+function parseLinuxCupsHeader(lines) {
+  const result = {}
+  if (lines && lines.length) {
+    if (lines[0].indexOf(' CUPS v') > 0) {
+      const parts = lines[0].split(' CUPS v');
+      result.cupsVersion = parts[1];
+    }
+  }
+  return result;
+}
+
+function parseLinuxCupsPrinter(lines) {
+  const result = {};
+  const printerId = util.getValue(lines, 'PrinterId', ' ');
+  result.id = printerId ? parseInt(printerId, 10) : null;
+  result.name = util.getValue(lines, 'Info', ' ');
+  result.model = lines.length > 0 && lines[0] ? lines[0].split(' ')[0] : '';
+  result.uri = util.getValue(lines, 'DeviceURI', ' ');
+  result.uuid = util.getValue(lines, 'UUID', ' ');
+  result.status = util.getValue(lines, 'State', ' ');
+  result.local = util.getValue(lines, 'Location', ' ').toLowerCase().startsWith('local');
+  result.default = null;
+  result.shared = util.getValue(lines, 'Shared', ' ').toLowerCase().startsWith('yes');
+
+  return result;
+}
+
+function parseLinuxLpstatPrinter(lines, id) {
+  const result = {};
+  result.id = id
+  result.name = util.getValue(lines, 'Description', ':', true);
+  result.model = lines.length > 0 && lines[0] ? lines[0].split(' ')[0] : '';
+  result.uri = null;
+  result.uuid = null
+  result.status = lines.length > 0 && lines[0] ? (lines[0].indexOf(' idle') > 0 ? 'idle' : (lines[0].indexOf(' printing') > 0 ? 'printing' : 'unknown')) : null
+  result.local = util.getValue(lines, 'Location', ':', true).toLowerCase().startsWith('local');
+  result.default = null;
+  result.shared = util.getValue(lines, 'Shared', ' ').toLowerCase().startsWith('yes');
+
+  return result;
+}
+
+// name
+// type
+// manufacturer
+// builtIn
+// default
+// revision
+// driver
+// (onboard)
+// #channels
+//   in
+//   out
+// interfaceType HDMI, Display - Port, Build -in, USB, PCIe(darwin: coreaudio_device_transport)
+// status
+
+function parseDarwinChannel(str) {
+  let result = '';
+
+  if (str.indexOf('builtin') >= 0) { result = 'Built-In'; }
+  if (str.indexOf('hdmi') >= 0) { result = 'HDMI'; }
+  if (str.indexOf('displayport') >= 0) { result = 'Display-Port'; }
+  if (str.indexOf('usb') >= 0) { result = 'USB'; }
+  if (str.indexOf('pci') >= 0) { result = 'PCIe'; }
+
+  return result;
+}
+
+function parseDarwinAudio(audioObject, id) {
+  const result = {};
+  const channelStr = (audioObject.coreaudio_device_transport || '');
+
+  result.id = id;
+  result.name = audioObject._name
+  result.manufacturer = audioObject.coreaudio_device_manufacturer;
+  result.default = !!(audioObject.coreaudio_default_audio_input_device || '') || !!(audioObject.coreaudio_default_audio_output_device || '');
+  result.revision = null;
+  result.driver = null;
+  result.channel = parseDarwinChannel(channelStr);
+  result.in = !!(audioObject.coreaudio_device_input || '')
+  result.out = !!(audioObject.coreaudio_device_output || '')
+  result.status = 'online';
+
+  return result;
+}
+
+function parseWindowsAudio(lines, id) {
+  const result = {};
+  const status = parseInt(util.getValue(lines, 'PrinterStatus', '='), 10);
+
+  result.id = id;
+  result.name = util.getValue(lines, 'name', '=');
+  result.model = util.getValue(lines, 'DriverName', '=');
+  result.uri = null;
+  result.uuid = null
+  result.status = winPrinterStatus[status] ? winPrinterStatus[status] : null;
+  result.local = util.getValue(lines, 'Local', '=') === 'TRUE';
+  result.default = util.getValue(lines, 'Default', '=') === 'TRUE';
+  result.shared = util.getValue(lines, 'Shared', '=') === 'TRUE';
+
+  return result;
+}
+
+function audio(callback) {
+
+  return new Promise((resolve) => {
+    process.nextTick(() => {
+      let result = [];
+      if (_linux || _freebsd || _openbsd || _netbsd) {
+        let cmd = 'cat /etc/cups/printers.conf 2>/dev/null'
+        exec(cmd, function (error, stdout) {
+          // printers.conf
+          if (!error) {
+            const parts = stdout.toString().split('<Printer ');
+            const printerHeader = parseLinuxCupsHeader(parts[0]);
+            for (let i = 1; i < parts.length; i++) {
+              const printers = parseLinuxCupsPrinter(parts[i].split('\n'));
+              printers.engine = 'CUPS';
+              printers.engineVersion = printerHeader.cupsVersion;
+              result.push(printers);
+            }
+          }
+          if (result.length === 0) {
+            if (_linux) {
+              cmd = 'export LC_ALL=C; lpstat -lp 2>/dev/null; unset LC_ALL';
+              // lpstat
+              exec(cmd, function (error, stdout) {
+                const parts = ('\n' + stdout.toString()).split('\nprinter ');
+                for (let i = 1; i < parts.length; i++) {
+                  const printers = parseLinuxLpstatPrinter(parts[i].split('\n'), i);
+                  result.push(printers);
+                }
+              });
+              if (callback) {
+                callback(result);
+              }
+              resolve(result);
+            } else {
+              if (callback) {
+                callback(result);
+              }
+              resolve(result);
+            }
+          } else {
+            if (callback) {
+              callback(result);
+            }
+            resolve(result);
+          }
+        });
+      }
+      if (_darwin) {
+        let cmd = 'system_profiler SPAudioDataType -json'
+        exec(cmd, function (error, stdout) {
+          if (!error) {
+            try {
+              const outObj = JSON.parse(stdout.toString());
+              if (outObj.SPAudioDataType && outObj.SPAudioDataType.length) {
+                for (let i = 0; i < outObj.SPAudioDataType.length; i++) {
+                  const audio = parseDarwinAudio(outObj.SPAudioDataType[i], i);
+                  result.push(audio);
+                }
+              }
+            } catch (e) {
+              util.noop()
+            }
+          }
+          if (callback) {
+            callback(result);
+          }
+          resolve(result);
+        });
+      }
+      if (_windows) {
+        util.wmic('printer get /value', function (error, stdout) {
+          if (!error) {
+            const parts = stdout.toString().split(/\n\s*\n/);
+            for (let i = 0; i < parts.length; i++) {
+              result.push(parseWindowsAudio(parts[i].split('\n'), i))
+            }
+          }
+          if (callback) {
+            callback(result);
+          }
+          resolve(result);
+        });
+      }
+      if (_sunos) {
+        resolve(null);
+      }
+    });
+  });
+}
+
+exports.audio = audio;
diff --git a/lib/index.d.ts b/lib/index.d.ts
index 9b4c1f8..407a633 100644
--- a/lib/index.d.ts
+++ b/lib/index.d.ts
@@ -717,6 +717,32 @@ export namespace Systeminformation {
     shared: boolean;
   }
 
+  interface UsbData {
+    id: number | string;
+    bus: number;
+    deviceId: number;
+    name: string;
+    type: string;
+    removable: boolean;
+    vendor: string;
+    manufacturer: string;
+    maxPower: string;
+    serialNumber: string;
+  }
+
+  interface AudioData {
+    id: number | string;
+    bus: number;
+    deviceId: number;
+    name: string;
+    type: string;
+    removable: boolean;
+    vendor: string;
+    manufacturer: string;
+    maxPower: string;
+    serialNumber: string;
+  }
+
   // 10. "Get All at once" - functions
 
   interface StaticData {
@@ -797,6 +823,10 @@ export function vboxInfo(cb?: (data: Systeminformation.VboxInfoData[]) => any):
 
 export function printer(cb?: (data: Systeminformation.PrinterData[]) => any): Promise<Systeminformation.PrinterData[]>;
 
+export function usb(cb?: (data: Systeminformation.UsbData[]) => any): Promise<Systeminformation.UsbData[]>;
+
+export function audio(cb?: (data: Systeminformation.AudioData[]) => any): Promise<Systeminformation.AudioData[]>;
+
 export function getStaticData(cb?: (data: Systeminformation.StaticData) => any): Promise<Systeminformation.StaticData>;
 export function getDynamicData(srv?: string, iface?: string, cb?: (data: any) => any): Promise<any>;
 export function getAllData(srv?: string, iface?: string, cb?: (data: any) => any): Promise<any>;
diff --git a/lib/index.js b/lib/index.js
index a5e4b2b..ce05876 100755
--- a/lib/index.js
+++ b/lib/index.js
@@ -39,6 +39,7 @@ const docker = require('./docker');
 const vbox = require('./virtualbox');
 const printer = require('./printer');
 const usb = require('./usb');
+const audio = require('./audio');
 
 let _platform = process.platform;
 const _windows = (_platform === 'win32');
@@ -491,6 +492,8 @@ exports.printer = printer.printer;
 
 exports.usb = usb.usb;
 
+exports.audio = audio.audio;
+
 exports.getStaticData = getStaticData;
 exports.getDynamicData = getDynamicData;
 exports.getAllData = getAllData;
diff --git a/package.json b/package.json
index 538c424..ae48d40 100644
--- a/package.json
+++ b/package.json
@@ -11,12 +11,7 @@
   },
   "types": "./lib/index.d.ts",
   "scripts": {
-    "clean": "rimraf dist",
-    "test-bare": "npm run compile && mocha ./test/**/*.test.js",
-    "compile": "tsc",
-    "watch": "tsc -w",
-    "test": "nyc mocha --require ts-node/register --require source-map-support/register  ./test/**/*.test.ts",
-    "coverage": "nyc report --reporter=text-lcov"
+    "test": "node ./test/test.js"
   },
   "files": [
     "lib/"
diff --git a/test/test.js b/test/test.js
index 9ff4049..4755ab8 100644
--- a/test/test.js
+++ b/test/test.js
@@ -1,7 +1,8 @@
 const readline = require('readline');
 const util = require('util');
-const { exec } = require('child_process');
+const exec = require('child_process').exec;
 const lib_version = require('../package.json').version;
+const path = require('path');
 
 let waiting = false;
 let timer;
@@ -74,7 +75,8 @@ process.stdin.on('keypress', (key, data) => {
   if (!waiting) {
     waiting = true;
     startDots();
-    exec(`node si.js '${key}'`, {timeout: 30000}, (error, stdout) => {
+    const siPath = path.join(__dirname, 'si.js');
+    exec(`node ${siPath} '${key}'`, {timeout: 30000}, (error, stdout) => {
       waiting = false;
       stopDots();
       clearline();