SuperMini nRF52840 Pro Micro Bluetooth LE (BLE) Controller – Keebio
nRF52840 Bluetooth 5.0 Module, Small Size, Stable Performance
Amazon.com: Seeed Studio XIAO nRF52840 Sense - Supports Arduino/CircuitPython - Bluetooth5.0 NFC with Onboard Antenna, MCU with 6-axis IMU Works with Amazon Sidewalk. : Electronics
Amazon.com: MDBT50Q-DB Nordic nRF52840 Module Demo Board Dev Kit 48 GPIO Bluetooth Module BT5.2 FCC IC CE Telec KC SRRC (Chip Antenna) : Electronics
Memory
nRF52840 Product Specification V1.7 (Revision History) November 2021 - XIAO - Seeed Forum
IMM-NRF52840 (BLYST840) | I-SYST's Site
guide to allocate the amount of ram/rom I need - Nordic Q&A - Nordic DevZone - Nordic DevZone
small size Nordic nRF52840 dongle BLE USB dongle bluetooth5.0 Dongle Adapter beacon for SmartHome sensors Smart Control - AliExpress