Specification: Dimensions: 0.63 x 0.52inch (16.05 x 13.33mm) Application: 1,for 5V microcontroller and 3.3V microcontroller serial communication. 2,for 3.3V serial downloader and 5V microcontroller serial communication. 3,for 5V microcontroller and 3.3V application module serial communication. Features: 1, comes with 3.3V voltage, with power indicator, and can provide no more than 150mA current. 2, to achieve direct serial port 5V and 3.3V level communication. 3, the highest sud rate 28800bps. 4, for UART, IIC, 1-wire, SPI bustable communication ba signal 3V-5V level conversion. Package Content: 5 x Logic Level Converters 10 x Pin Headser