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