CC2540F256 Module Integrated Bluetooth 4.0/Ble-Nano Motherboard For Arduino Nano 1. BLE-NANO is a product based on Bluetooth 4.0 protocol combined with for Arduino nano v3.0. Its functions and pins are compatible with for traditional Arduino nano v3.0 motherboards.2. The working frequency band is in the 2.4GHz range, which supports users to modify and view the device name, service UUID, transmission power, pairing password and other commands through AT commands, which is convenient and flexible to use.3. The product is small in size, suitable for working environment with limited volume4. Powerful Bluetooth connection, and may need to use all sensors to design innovative applications5. The current wearable mobile phone peripheral devices can be developed with the BLE-NANO platform, and BLE-NANO can be used to connect with Bluetooth 40 devices to achieve wireless transmission between two Bluetooth devices, and master-slave settings. Product parameters:BLE chip: CC2540F256Support AT command to configure BLESupport USB virtual serial port, hardware serial port, BLE three-way transparent transmissionSupport master-slave switchSupport Bluetooth automatic slave in host modeInterface: Mirco-USBInput voltage: USB 5V power supply or external DC 6-12N power supplyPin spacing: 2.54mmMeasured effective distance connection: 10 metersColour: blackMaterial: PCB+metalSize: 20 x 11 x 6.5MMPackage Contents:1 x Ble-Nano motherboardOnly the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.