Amazon.com: DSD TECH HM-10 Bluetooth 4.0 BLE iBeacon UART ...
Low Energy: With HM-10 bluetooth 4.0 module, you can add Bluetooth features to your project and support iphone4s or later. DSD TECH Brand 4pin Base Board: Through this base board, leads to VCC, GND, TX, RX. You can be very convenient to connect to your arduino project. working voltage 3.6 V to 6V,Default rate of 9600.
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