HLK-B40 Serial Port Transmission 5.1 Bluetooth Module, supporting bluetooth 5.1 protocol, has 48Mhz main frequency and 32-bit ARM Cortex It is a module with M3 core. Master-slave integration allows you to set the module as master or slave. It supports connecting up to 20 host devices simultaneously in slave mode.
It has very low power consumption. It consumes 6μA energy in sleep mode. It has a range of 40-100m in open air. Its size is quite small, only 14mm×9.5mm×2mm.
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