... ).CSR8 Chipset 3).Small size low engergy bluetooth pcb module 4.0 Bluetooth Module can be applied to kinds ... , the process will be completed automatically. Features:* Bluetooth 4.0* On-board antenna or External antenna* Working temperature ... interface* Support multi baud rate(such asl.2k, 2.4, 4.8, 9.6k, 19.2k, 38.4k, 57. ... Safe authentication, data encryption.Photo: low engergy bluetooth pcb module 4.0