IR Blaster is a modern controller technology through which mobile phones can easily control other remote control devices without a remote. It is an amazing technology. If you are using an Oppo Reno8 Pro (China) smartphone, you cannot use this feature because this phone does not support the IR Blaster feature.
Oppo Reno8 Pro (China) is an expensive smartphone with many new features. But despite being so expensive, this phone does not support the IR Blaster feature.