This module converts logic levels of 3.3V and 5V to one another. This is bidirectional.

Dimension: 4.1*1.8cm
Compatible with breadboard
8-channel high-voltage and low-voltage logic converter, bidirectional

Instructions
HV- 5V
LV- 3.3V
GND- Power, two grounds
LVx Input/Output 3.3V TTL,
HVx input/output 5V TTL,
LVx and HVx converter, bidirectional