BLE (dual) Bee v1.0 uses CSR dual mode Bluetooth chip,with the ARM architecture single chip which supports AT instructions, Users can develop flexibly according to the serial baud rate, equipment name, pairing password. Features: BT Version: Bluetooth Specification V4.0 & BLE UART send and receive max bytes is 512 Other device to module in SPP mode: 90 Bytes per packet Other device to module in BLE mode: 20 Bytes per packet Two data transmission mode, balance mode and high speed mode Working frequency: 2.4GHz ISM band Modulation method: GFSK(Gaussian Frequency Shift Keying) RF Power: -23dbm, -6dbm, 0dbm, 6dbm. Speed: Asynchronous: 3K Bytes Synchronous: 3K Bytes Security: Authentication and encryption Service: Slave SPP, Peripheral BLE, UUID FFE0,FFE1 Power: +3.3VDC 50mA Long range: SPP 30 meters, BLE 60 metersPower: SPP 13.5mA, BLE 9.5mA Working temperature:–5 ~ +65 Centigrade For more detail, please visit: http://www.seeedstudio.com/item_detail.html?p_id=2406 http://www.seeedstudio.com/wiki/BLE_(dual)_Bee_v1.0