B500D is one of the Luguang series parts, which is an ultra mini Bluetooth 5.0 low-power dual-mode module designed for IoT and home appliances. It supports multiple ultra-low power operating modes and fast wake-up connection of smart devices. It has a built-in MCU and can be used in combination with an external MCU to provide an ultra-small solution for audio, frequency hopping and communication applications. B500D also integrates full Bluetooth5.0 protocol stack, ultra low power BLE operation, GAP / ATT protocol support, and uses a standard ARM Cortex-M0 core, which can provide up to 32KB Flash memory storage and 4KB RAM for users to use. In addition, B500D supports key wakeup and scanning wakeup, and can transmit / receive data under 0dBm power.