The bi-directional level converter is a small device that can safely downgrade 5V signals to 3.3V while simultaneously upgrading 3.3V to 5V. This bi-directional module works with 2.8V and 1.8V devices and can be transmitted bi-directional between high voltage and low voltage with 4 channels. Each level converter can convert 4 pins on the high side into 4 pins on the low side, with two inputs and two outputs for each side. Colour:blue Material:plastic Package Contents: 10 * 4 Channel I2C Level Converter Bi-Directional Module Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.