Чип BL702C (Bouffalo lab).
Инфо:
32-bit RISC CPU with FPU, 1 to 144 MHz
132KB RAM, 192KB ROM, 1Kb eFuse, 8 Mbit FLASH
BLE5.0+ (PHY 1Mbps/2Mbps/LongRange: 500/125Kbps), Zigbee 3.0 (NDA), IEEE 802.15.4, TX Power: 0-14 dBm
USB2.0 FS, 2xUARTs, IR, I2C, I2S, SPI, PWM, QD, 12-bit ADC, 10-bit DAC...