Upgraded hardware from 2 with wireless communication, onboard antenna, features 2.4GHz 802.11n WIFI and Bluetooth 5.2. Onboard CYW43439 wireless chip, supports WIFI 4 wireless and Bluetooth 5.2. Adopts unique dual-core and dual-architecture design: dual-core Arm -M33 processor and dual-core Hazard3 RISC-V processor, flexible clock running up to 150 MHz.