HLK-B40 Serial Port Transmission 5.1 Bluetooth Development Kit, supporting bluetooth 5.1 protocol, 48Mhz main frequency and 32-bit It has a module with ARM Cortex 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 a range of 40-100m in open air.
Computer etc. It is a development kit that you can use on devices.
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