50Pcs 3.3V 5V TTL Bi-directional Logic Level Converter for Arduino - products that work with official Arduino boards

50Pcs 3.3V 5V TTL Bi-directional Logic Level Converter For
Feature:
2 channels of high-voltage logic and low-voltage logic bilateral switching
2-channel of high-voltage logic switch low voltage logic  into unitary transformation
Size: 15.5mm x 16mm x 11.5mm
Module is compatible with the breadboard, it can be put on the breadboard directly

Description:
High Voltage: 5V
Low Voltage: 3.3V
GND for negative power
5V TTL RXI input, 3.3V TTL RXO output
TXI input/output of 3.3 V TTL, TXO input/output 5 V TTL, TXI and TXO bilateral switching

Package included:
50 x Logic Level Converter