Microchip RN4871-I/RM130 Bluetooth SoC 4.2

The RN4871 is a small form factor, Bluetooth Low Energy module measuring just 9 x 11.5 x 2.1 mm. This fully-integrated module is designed for easy implementation into a broad range of applications. It delivers up to 2.5x throughput improvement and more secure connections vs. Bluetooth 4.1 based products. Developers can easily interface to the device via a standard UART interface, available on most Microcontrollers and Processors. The RN4871 has a completely integrated Bluetooth software stack, and built-in antenna.

ASCII interface commands for communication with the host microcontroller
Scripting features to allow for operation without a host microcontroller.
Increased privacy features
White list for determining connections
Remote configuration capability
1.9V∼3.6V operating range
UART/ I2C/ SPI interface supported