Xiaomi Auto recently released the "Xiaomi SU7 answer netizens' questions", involving super power-saving mode, NFC unlocking, and pre-heating battery setting methods. Xiaomi Auto officials said that the NFC card key of the Xiaomi SU7 is very easy to carry and can realize functions such as unlocking the vehicle. In addition, the Mi SU7 also supports the Mi Band set as the car key. The Xiaomi Watch S3 is currently supported. When the NFC key is opened for it, it can be used as the car key to unlock the millet SU7. It is worth noting that in the OTA upgrade in early May, the official will support a number of bracelet devices to unlock vehicles through NFC. It is reported that when using these wristband devices to unlock the vehicle, the user needs to put the wristband near the NFC reader on the vehicle, the reader will read the information in the wristband and trigger the corresponding action to complete the unlocking or locking of the vehicle. In addition to the bracelet device, the Xiaomi SU7 also supports a variety of other car key unlocking solutions, including physical remote control keys, NFC card keys and mobile phone Bluetooth keys. It should be noted that in order to ensure the security of the vehicle and the privacy of the user, some details need to be paid attention to when using these wristband devices to unlock the vehicle. For example, users need to make sure that the NFC function of the wristband device is turned on and that the wristband has been properly paired and set up with the vehicle. In addition, users also need to pay attention to avoid placing the bracelet equipment in a high temperature environment for a long time or contacting high temperature electrical appliances, so as not to affect the performance and service life of the bracelet.