It is a small device that safely steps down 5V signals to 3.3V AND steps up 3.3V to 5V at the same timeYou can successfully set your high and low voltages and step up and down between them safely on the same channelIt can convert 4 pins on the high side to 4 pins on the low side with two inputs and two outputs provided for each sideLogic level shifter Bi-Directional with 4 channels between high logic and low logicCompatible with breadboard, can be directly use in breadboar Specification: For example: High voltage is 5V, low voltage is 3.3VHV connect with 5V power supply connect with 3.3V power supplyGND connect the power negative polex input/output 3.3V TTLHVx input/output 5V TTLBi-Directional transform between x and TVxSmall module with 1.3cm X 1.5cmWith 2 rows of 6 pinThis level converter also works with 2.8V and 1.8V devicesHigh voltage (5V for example) to the 'HV' pin, low voltage (3.3V for example) to ', and ground from the system to the 'GND' pins Package Includes: 3 x Bi-Directional transform module6 x rows of pins Note: Please allow 1-3mm error due to manual measurement, make sure you do not mind before you bidThe colors may be different for the different display, please understand