DFRobot Romeo BLE Mini Arduino Robot Control Board with Bluetooth 4.0

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4.0 HM-10 CC2540 CC2541 BLE Bluetooth Serial Wireless Module for Arduino

Bluetooth 4.0 iBeacon Module BLE Near-Field Positioning Sensor For Andorid Apple

4Pcs AT-09 Bluetooth 4.0 Transceiver BLE Module Serial Port CC2541 HM-10 MLT-BT0

NRF51822 Bluetooth 4.0 Wireless Module Compatible For iBeacon Base Station

CC2541 BLE Bluetooth 4.0 UART Transceiver Module CC2540 HM-10 Compatible iBeacon