[Chip solution]：DA14580

[Working frequency]： 2.379~2.496GHz

[Support protocol]： BLE 4.2

[Communication distance]：70m

[Interface type]：UART

[Product weight]：1.0±0.1g

[Introduction]：E104-BT02 is a SMD 1mW (0dBm) wireless UART to ble module with high cost performance, small size and embedded PCB antenna and operates at 2.4 GHz frequency band. Serial port (UART) can be used to receive and transmit ble data, which lowers the threshold to apply ble.