This is a Bluetooth audio transmitter module that integrates computer USB sound card to Bluetooth-compatible transmission and line audio input and launch. | It adopts Bluetooth4.1 technology to greatly ensure the quality and stability of audio transmission. | This product can be used for most of the products. Bluetooth-compatible transmitter function for desktop computers, notebook computers, TVs, projectors, game consoles, IPOD, CD players, MP3s, etc. | Wireless transmission distance >= 10 meters | With LED indication

Antenna form: onboard PCB antenna / IPEX external antenna | Spectrum range: 2400~2483.5MHz | Power supply voltage: 5V, Power supply current: > 800mA | Serial port rate: support 110~4608000 bps, default 115200 bps | SPI Flash: default 32Mbit

Supply voltage: DC 5V；Supply current: >100mA；Standby power consumption: about 17.5mA | Communication method: serial communication (5V TTL level) | Transmitting distance: 6-10 meters；Receiving distance: 6-10 meters | Support NEC encoding chips: (typical encoding chips such as uPD6121, uPD6122, TC9012 and many compatible chip models, such as PT2221, PT2222, SC6121, SC6122, SC9012, etc.) | Infrared signal: wavelength 940nm 38KHz；Baud rate: default 9600bps, the serial port can be set to 4800, 19200, 57600bps

This module is the 16 way IO extension module of the 12C interface, and built in the MCP23017 chip of MicroChip. | Each IO can be arbitrarily configured as input or output, and a pull up resistor can be set, and the interrupt function can be enabled for the IO configured as input. The IO interface has a strong driving capacity, and the current and current can reach 25mA. | MCP23017 is a high-speed IIC interface. It supports the IIC frequency of 100KHz, 400KHz and 1.7MHz. The chip has 3 address pins, which can be set up for 8 different addresses. So 8 modules can be connected through two IIC buses to achieve up to 128 IO extensions. | This module is flexible in configuration and strong in driving ability. There are many parallel connections. | Working voltage:3.0-5.5V，Working current: 1uA，IIC communication frequency: maximum 1.7MHZ