M5Stamp C3 Mate with Pin Headers M5Stack M5Stamp C3 Mate with Pin Headers features an Espressif ESP32-C3 RISC-V MCU with Wi-Fi and BLUETOOTH® 5 (LE) connectivity for IoT edge devices, designed for home appliances and industrial automation. The M5Stamp C3 Mate offers a more secure way to answer the Bluetooth security concerns by merging the RSA-3072-based secure boot and the AES-128-XTS-based flash encryption. This also makes the M5Stamp C3 optimal for industrial IoT equipment collecting sensor data within a factory or a building.