RN4020 module equivalent, bluetooth low energy module.
* Fully certified Bluetooth® version 4.1 module
* On-board Bluetooth Low Energy 4.1 stack
* ASCII command interface API over UART
* Device Firmware Upgrad.
* Remote commands over-the-air
* 64 KB internal flash
* Compact form factor: 11.5 x 19.5 x 2.5 mm
* Cast.
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