Many phones today have hardware built in for controlling TVs. This hardware is called an IR Blaster. Manufactures such as Samsung, LG, HTC, Xiaomi, and Huawei are using the IR Blaster in their phones. It emits an infrared signal which can be picked up and interpreted by the TV. IR Universal Remote has a very large database containing the proper codes for many different devices. It can emit these codes through the IR Blaster just like a physical universal remote.
