This cheap drone setup is for everyone who doesn’t want to spend a lot of money and has no interest in filming with FPV. If you later decide to invest more, you won’t be able to reuse any of these components, but it’s a great way to test if FPV is for you.
The rubber bands are awesome to mark which battery is full. I always connect the balancer cord to the main lead and remove it when I flew the battery. The beeper is perfect to locate your drone after a crash, especially when your main battery gets ripped off. This saved some of my drones, but you need to solder it to the flight controller yourself. Using Kot King I managed to make my drone waterproof. I applied it to all open electrical parts except the motors.