4-in-1 temperature, humidity, luminosity wifi sensor and clock NEO NAS-TH02 NAS-CW01W6

This is the teardown of a device providing temperature, humidity and luminosity information through Tuya Smartlife, with Wifi. Another version exists with ZigBee protocol.
This wifi version also provides a clock and date, which is quite practical.

Here is a review of the ZigBee version (without the clock) :
https://www.lesalexiens.fr/labo-test-alexa/te...-capteur-zigbee-simple-complet-et-polyvalent/

Here are photos of the packaging:








To open it, there are no screw, only plastic and glue. I've opened it only with the following opening tool.


I had to force it quite a lot at the bottom and on the left and right sides. Be careful with the top side, as there's the connector going to the screen.









Here is the result once it's open.





One can see that this device uses a bk7231n chip to provide Wifi and bluetooth services.

If one wants to remove completely the board, one has to unsolder the 4 connectors linked to the batteries.