DL-CC2340-A and DL-CC2340-B BLE modules are both designed base on TI's SimpleLink™ wireless series CC2340R5 Bluetooth® Low Energy Chip, which uses a 48-MHz Cortex-M0+ kernel, integrates up to 512 KB of flash memory, 36 KB of SRAM,and has up to 26 universal I/O interfaces. Moreover, these Bluetooth Low Energy modules are equipped with a built-in 48MHz 10PPM external high-speed clock, and 32.768Khz external low-speed clock.

DL-CC2541 is a low-power Bluetooth 4.2 module. The module can work in bridge mode (transparent transmission mode) and direct drive mode, it features an universal serial port design, full duplex bidirectional communication

Low-power BLE4.2 Bluetooth Module with UART serial communication, which integrates a high-performance 2.4GHz RF transceiver chip, and feature-rich baseband processor (ARM968E-S MCU), with built-in 160KB Flash and 20KB RAM

BLE5.0 Bluetooth Module with Nordic nRF52832 Chip, low-power, long-distance