Red rice K40 with headphones, if it is a wireless wireless Bluetooth machine, basically all ID cards, all wireless Bluetooth machines will be basically universal, as long as the Bluetooth module is paired with your mobile phone, then if you can contact the WiFi, Basically, the Bluetooth is basically able to carry out mobile is able to be connected, if the practical wired headset, you need to buy a type C interface of a game headset.
Red rice k40 is no headphone interface, only a type-c interface, all as long as the interface is adapted to the headset can be used. But the best fit for the k40 is Redmi's original headphones, because the general original headphones take into account the internal design of the phone.