Side 1 IC Identification, Pt. 1:

Apple APL1W82 64-Bit Dual-Core Applications Processor w/ GPU with likely 1 Gb LPDDR3 SDRAM Memory

This is the same processor found in the Apple Watch Series 5, just not protected by a boatload of epoxy.

Apple 338S00553-A0 Power Management

Nordic Semiconductor nRF52833 Bluetooth 5.2 SoC w/ NFC and Zigbee

Skyworks SKY66404-11 2.4 GHz Zigbee/Thread/Bluetooth Front-End Module

USI 339M00117 WiFi/Bluetooth Module

USI UWB Transceiver