Feature:  Wireless parameter: Wireless standard: 802.15.1.  Bluetooth specification: V4.2.  Frequency Range: 2.402GHz-2.480GHz.  Transmit power: -14dBm to +8dBm.  User can configure via AT command.  Receiving sensitivity: -85dBm.  Antenna option: External: I-PEX connector.  Built-in: onboard antenna.  Hardware parameter: Data interface: UART: 1200bps -921600bps.  Operating Voltage: 1.7V~3.6V.  Working current: 500nA~10mA.  Operating temperature: -40°C- 85°C.  Storage temperature: -40°C-85°C.  Size: 18.2×26.7×3 (mm).  Software parameter: Equipment type: ma-ster/slave.  Security Mechanism: 128-bit AES engine.  Data encryption: PC1 encryption.  Operating mode: ma-ster mode, slave mode, broadcast mode, Mesh networking.  Setting command: AT+ command structure.  User configuration: Serial AT command, transparent transmission of AT commands.  Customer application software: Support customer customized application software.     Package includes:  3 x Module Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-DIMEANI official store