HC-05 Bluetooth Transceiver ModuleDefault COM setting: 9600, N, 8,1Default Password/pairing code: 1234.Supports the AT command to modify the baud rate, device name, passkey, master/slave, etc.Supports baud rates 2400 -1382400.Based on the CSR Bluetooth chip BC417143Bluetooth specification v2.0 + EDRPower supply: +3.3VDC 50mAFrequency: 2.4GHz ISM bandModulation: GFSK(Gaussian Frequency Shift Keying)Emission power: ≤4dBm, Class 2Sensitivity: ≤-84dBm at 0.1% BERSpeed: Asynchronous: 2.1Mbps(Max) / 160 kbps, Synchronous: 1Mbps/1MbpsSecurity: Authentication and encryptionSize: 26.9mm x 13mm x 2.2 mm.Working temperature: -20 ~ +75 CentigradeDimension: 26.9mm x 13mm x 2.2 mm