The button would be IR mode when disconnected from Bluetooth.
Only the "Power" button has infrared value when connected to Bluetooth.
Press "OK" + "volume +/-" shortly to control the speed of the mouse.
In IR mode, it supports full button learning, with no mouse function.
In Bluetooth mode, the voice function is applicable to some ATV devices, like TCL Smart TV, Shield TV Box, HAKO mini, G-oogle TV, etc. But the voice function may be incompatible with the other devices.