Features: HC-05 wireless module adopt CSR mainstream chip and wireless version 2.0 standard. The working voltages of the module is 3.30V. Working current: 30MA, 8MA for communication. Standard bauds rate is 9600, which can be set by users. Used in navigation system and water, electricity and gas meter reading system.Use computers and wireless adapters, and seamlessly devices. With LED indicator, using 150mA and 3.30V voltages stabilizing chip. Specifications: Module size: about 37.5x156mm/1.48x0.61in Coverage is 30 feet. Wireless version: Version 2.0+EDR Working voltages: 3.30V Working current: 30MA, 8MA for communication. Standard bauds rate: 9600.8.1, n. Signal coverage: 30 feet Input voltages: 3.3~ 6V Package Includes: 1PC HC-05 Wireless Transceiver Slave Module note: Input power supply is 3.3 ~ 6V, and it is forbiddened to exceed 7V. There is no "automatic power supply reverse connection prevention function", please connect the power supply correctly. We recommend installing the Wireless Mainboard Module. If there is only a board, there is no "Wireless function"