SKU : B08005 SPECIFICATION Microcontroller: ATmega328P Bootloader: Arduino UNO On-board BLE chip: TI CC2540 Transmission range: 70m in free space Support bluetooth remote update the Arduino program Support Bluetooth HID Support iBeacons Support AT command to config the BLE Support Transparent communication through Serial Support the master-salve machine switch Support usb update BLE chip program 14 Digital I/O ports 6 PWM Outputs (Pin11, Pin10, Pin9, Pin6, Pin5, Pin3) 8 10-bit analog input ports 3 I2Cs Two way H-bridged Motor Driver with 2A maximum current 5 Buttons Support Male and Female Pin Header Integrated sockets for APC220 RF Module Power Supply Port: USB or DC2.1 External Power Supply Range: 5-23V DC output: 5V/3.3V Auto sensing/switching external power input Size: 94mm x 80mm(3.70\x3.15\) DOCUMENTS Wiki Doc dfrobot*com/wiki/index.php/RoMeo_BLE_(SKU:DFR0305)