diff --git a/doc/rest-client.md b/doc/rest-client.md
index 76c7289..2b7f72a 100644
--- a/doc/rest-client.md
+++ b/doc/rest-client.md
@@ -4,9 +4,13 @@
 ## Class: RestClient
 
 
-### new RestClient([key][, secret])
+### new RestClient([key][, secret][, livenet][, options])
 - `key` {String} Bybit API Key
 - `secret` {String} Bybit private key
+- `livenet` {Boolean} If false (default), use testnet.
+- `options` {Object} Optional settings for custom behaviour.
+  - `recv_window` {Number} Optional, default 5000. Increase if recv errors are seen.
+  - `sync_interval_ms` {Number} Optional, default 3600000. Interval at which syncTime is performed.
 
 If you only use the [public endpoints](#public-endpoints) you can ommit key and secret.
 
diff --git a/lib/request.js b/lib/request.js
index 7ad6527..063063a 100644
--- a/lib/request.js
+++ b/lib/request.js
@@ -3,24 +3,30 @@ const assert = require('assert');
 
 const request = require('request');
 
-const {signMessage, getServerTimeOffset} = require('./utility.js');
+const {signMessage} = require('./utility.js');
 
 const baseUrls = {
   livenet: 'https://api.bybit.com',
   testnet: 'https://api-testnet.bybit.com'
-}
+};
 
 module.exports = class Request {
 
-  constructor(key, secret, livenet=false) {
+  constructor(key, secret, livenet=false, options={}) {
     this.baseUrl = baseUrls[livenet === true ? 'livenet' : 'testnet'];
     this._timeOffset = null;
     this._syncTimePromise = null;
 
+    this.options = {
+      recv_window: 5000,
+      sync_interval_ms: 3600000,
+      ...options
+    }
+
     if(key) assert(secret, 'Secret is required for private enpoints');
 
     this._syncTime();
-    setInterval(this._syncTime.bind(this), 3600000);
+    setInterval(this._syncTime.bind(this), parseInt(this.options.sync_interval_ms));
 
     this.key = key;
     this.secret = secret;
@@ -91,6 +97,11 @@ module.exports = class Request {
       timestamp: Date.now() + this._timeOffset
     };
 
+    // Optional, set to 5000 by default. Increase if timestamp/recv_window errors are seen.
+    if(this.options.recv_window && !params.recv_window) {
+      params.recv_window = this.options.recv_window;
+    }
+
     if(this.key && this.secret) {
       params.sign = signMessage(this._serializeParams(params), this.secret);
     }
diff --git a/lib/rest-client.js b/lib/rest-client.js
index 3a676f7..467d7b8 100644
--- a/lib/rest-client.js
+++ b/lib/rest-client.js
@@ -5,7 +5,7 @@ const Request = require('./request.js');
 
 module.exports = class RestClient {
 
-  constructor(key, secret, livenet=false) {
+  constructor(key, secret, livenet=false, options={}) {
     this.request = new Request(...arguments);
   }