DFRobot Beetle BLE - Arduino Bluetooth 4.0 (BLE) DFRobot Bluno series is an Arduino-compatible Bluetooth 4.0(BLE) hardware solution designed by makers,and for makers. All Bluno products are Bluetooth 4.0 ready,and enjoy features such as wireless programming,smart App controlling,long communication range,and plentiful periphery modules. The Beetle Ble is an Arduino Uno based board with bluetooth 4.0 (BLE) It is probably the smallest Arduino BLE board in the market ATmega328@16MHz / Bluetooth Low Energy (BT 4.0) / Micro USB port Super Compact Size / Support Wireless Programming. Download User Guide on this page for more information. (Technical Specification - User Guide)