Luckkyme 10PCS 4 Channels IIC I2C Logic Level Converter Bi-Directional Shifter Module 3.3V to 5V for Arduino

These are active low and although probably work fine for IIC / I2C, they are not useful for voltage conversion, for example 5v PNP sensor to 3.3v ESP32 input (my application).When you put 5v on HV and 3.3v on LV pins, it distributes it 5v to HV1-4 and 3.3v to LV1-4.Then if you tie HV1 to GND, LV1 goes to 0volts and vice versa.They work but not if you're trying to convert active high signals, as I was.After inquiring with Luckkyme, they issued a full refund without question.Still would have been useful to include in the description.

It's a great tiny board, 4 bidirectional signals between 3.3 and 5 volt chips. Great for i2c

Functions as expected, but the PCB design is low on quality. Holes barely have any copper to solder.