this is 5 units of Adafruit nRF52832 Module, product 4077 - Raytac MDBT42Q module that Adafruit resold on a breakout/product page. Brand new from mouser electronics in original Package never opened The microcontroller itself is the Nordic Semiconductor nRF52832, an ARM Cortex-M4F SoC. ultra low power - months or years of BLE. Key specifications: * CPU: 64 MHz ARM Cortex-M4F (with floating-point unit) * Flash: 512 KB * RAM: 64 KB * Wireless: Bluetooth 5 (Bluetooth Low Energy), Bluetooth Mesh, ANT, 2.4 GHz proprietary protocols * GPIO: Up to 32 GPIOs (depending on module routing) * Peripherals: SPI, I²C (TWI), UART, PWM, ADC, PDM, NFC-A, etc. * Operating voltage: 1.7–3.6 V
