~~1. GPS tracking devices: Tracking devices are a must for a journey for if you lose your way you'll find another. People travelling in personal vehicles can use tracking devices. While many websites like MapmyIndia offer GPS devices that can be remotely tracked. Or you can take a compass to help yourself is you know it or download apps which track locations.
2. Tablet: Don't forget to take a tablet or phablet or an e-reader with yourself for if you get bored they may help you in entertainment. Watch movies and videos as much as you like.
If you're an avid reader, Kindle is for you, go get it. It can also work as an alternative if your smartphone's battery dies.
3. Dual-USB storage devices: Such devices can be used to transfer data quickly from one device to another. Further, you can take it along as a backup for internet if your videos and movies are already stored in.
4. Bluetooth speakers: Enjoy the melodies and high notes of music which are now available in budget by many companies like Xiaomi, JBL etc. Its your wish if you wanna dance or sing, just flow or fly.
5. Portable chargers: Portable chargers are available nowadays everywhere, so that you can charge your phone at the go anywhere anytime as you wish.