diff --git a/.env-example b/.env-example
index 374eb99..b52a73b 100644
--- a/.env-example
+++ b/.env-example
@@ -1,18 +1,18 @@
 EMAIL_USERNAME="youremail@gmail.com"
 EMAIL_PASSWORD="secretpassword"
 NOTIFICATION_TEST="false"
+OPEN_BROWSER="true"
 PAGE_TIMEOUT="30000"
+PHONE_NUMBER="1234567890"
+PHONE_CARRIER="tmobile"
+PLAY_SOUND="notification.mp3"
+PUSHOVER_TOKEN="123pushover-token456"
+PUSHOVER_USER="123pushover-user-key"
 RATE_LIMIT_TIMEOUT="5000"
+SHOW_ONLY_BRANDS="evga"
 SLACK_CHANNEL="SlackChannelName"
 SLACK_TOKEN="slack-token"
 STORES="bestbuy,bandh,nvidia"
-PHONE_NUMBER="1234567890"
-PHONE_CARRIER="tmobile"
-PUSHOVER_TOKEN="123pushover-token456"
-PUSHOVER_USER="123pushover-user-key"
-OPEN_BROWSER="true"
-PLAY_SOUND="false"
 SCREENSHOT="true"
 TELEGRAM_ACCESS_TOKEN=""
 TELEGRAM_CHAT_ID="1234"
-SHOW_ONLY_BRANDS="evga"
diff --git a/README.md b/README.md
index 9243477..eecb287 100644
--- a/README.md
+++ b/README.md
@@ -56,33 +56,33 @@ At any point you want the program to stop, use <kbd>Ctrl</kbd> + <kbd>C</kbd>.
 
 ### Customization
 
-To customize `nvidia-snatcher`, make a copy of `.env-example` as `.env` and make any changes to your liking.
+To customize `nvidia-snatcher`, make a copy of `.env-example` as `.env` and make any changes to your liking. _Note that all environment variables are **optional**._
 
 Here is a list of variables that you can use to customize your newly copied `.env` file:
 
-| **Environment variable** | **Description** |
-|:---:|---|
-| `EMAIL_USERNAME` | Gmail address (e.g., `jensen.robbed.us@gmail.com`); optional |
-| `EMAIL_PASSWORD` | Gmail password; see below if you have MFA; optional |
-| `NOTIFICATION_TEST` | Test all the notifications configured; optional, default: `false` |
-| `PAGE_TIMEOUT` | Navigation Timeout in milliseconds (`0` for infinite); optional, default: `30000` |
-| `PHONE_NUMBER` | 10 digit phone number (e.g., `1234567890`); optional, email configuration required |
-| `PHONE_CARRIER` | [Supported carriers](#supported-carriers) for SMS; optional, email configuration required |
-| `RATE_LIMIT_TIMEOUT` | Rate limit timeout for each full store cycle; optional, default: `5000` |
-| `SHOW_ONLY_BRANDS` | If set, will only show specified brands, seperated by `,` |
-| `SLACK_CHANNEL` | Slack channel for posting (e.g., `update`); optional |
-| `SLACK_TOKEN` | Slack API token; optional |
-| `STORES` | [Supported stores](#supported-stores) you want to be scraped; optional, default: `nvidia` |
-| `OPEN_BROWSER` | Toggle for whether or not the browser should open when item is found, default: `true` |
-| `PLAY_SOUND` | Play this sound notification if a card is found.; optional |
-| `SCREENSHOT` | Capture screenshot of page on successful hit; optional, default `true` |
-| `TELEGRAM_ACCESS_TOKEN` | Telegram access token; optional |
-| `TELEGRAM_CHAT_ID` | Telegram chat ID; optional |
+| **Environment variable** | **Description** | **Notes** |
+|:---:|---|---|
+| `EMAIL_USERNAME` | Gmail address | E.g.: `jensen.robbed.us@gmail.com` |
+| `EMAIL_PASSWORD` | Gmail password | See below if you have MFA | 
+| `NOTIFICATION_TEST` | Test all the notifications configured | Default: `false` |
+| `OPEN_BROWSER` | Toggle for whether or not the browser should open when item is found | Default: `true` |
+| `PAGE_TIMEOUT` | Navigation Timeout in milliseconds | `0` for infinite, default: `30000` |
+| `PHONE_NUMBER` | 10 digit phone number | E.g.: `1234567890`, email configuration required |
+| `PHONE_CARRIER` | [Supported carriers](#supported-carriers) for SMS | Email configuration required |
+| `PLAY_SOUND` | Play this sound notification if a card is found | E.g.: `path/to/notification.wav`, valid formats: wav, mp3, flac, [free sounds available](https://notificationsounds.com/) |
+| `PUSHOVER_TOKEN` | Pushover access token |
+| `PUSHOVER_USERNAME` | Pushover username |
+| `RATE_LIMIT_TIMEOUT` | Rate limit timeout for each full store cycle | Default: `5000` |
+| `SHOW_ONLY_BRANDS` | Filter to show specified brands | Comma separated, E.g.: `evga,zotac` |
+| `SLACK_CHANNEL` | Slack channel for posting | E.g., `update`, no need for `#` |
+| `SLACK_TOKEN` | Slack API token |
+| `STORES` | [Supported stores](#supported-stores) you want to be scraped | Comma separated, default: `nvidia` |
+| `SCREENSHOT` | Capture screenshot of page if a card is found | Default: `true` |
+| `TELEGRAM_ACCESS_TOKEN` | Telegram access token |
+| `TELEGRAM_CHAT_ID` | Telegram chat ID |
 
 > :point_right: If you have multi-factor authentication (MFA), you will need to create an [app password](https://myaccount.google.com/apppasswords) and use this instead of your Gmail password.
 
-> :point_right: Free sounds available [here](https://freesound.org/home/). Place sounds into `resources/sounds/`
-
 #### Supported stores
 
 | **Stores** | **Environment variable** |
diff --git a/src/config.ts b/src/config.ts
index a37470e..bb895a8 100644
--- a/src/config.ts
+++ b/src/config.ts
@@ -23,8 +23,8 @@ const notifications = {
 	},
 	playSound: process.env.PLAY_SOUND ?? '',
 	pushover: {
-		token: process.env.PUSHOVER_TOKEN,
-		user: process.env.PUSHOVER_USER
+		token: process.env.PUSHOVER_TOKEN ?? '',
+		user: process.env.PUSHOVER_USER ?? ''
 	},
 	slack: {
 		channel: process.env.SLACK_CHANNEL ?? '',
diff --git a/src/notification/sound.ts b/src/notification/sound.ts
index 3376929..75b52c8 100644
--- a/src/notification/sound.ts
+++ b/src/notification/sound.ts
@@ -1,9 +1,9 @@
-import playerLib = require('play-sound');
+import playerLib from 'play-sound';
 import {Config} from '../config';
 import {Logger} from '../logger';
-import * as fs from 'fs';
+import fs from 'fs';
 
-const notificationSound = './resources/sounds/' + Config.notifications.playSound;
+const notificationSound = Config.notifications.playSound;
 const player = playerLib();
 
 export function playSound() {