Features: brand new and high quality This module provides feasibility in different devices of 3.3V and 5.0V, and acts as a bridge for MCU development boards and devices. The four MOS tubes realize the two-way conversion of four 3V and 5V levels. The power input has anti-reverse connection protections, integrated 3.3VLDO, and can provide an external current of no more than 150mA. With power indicator, clear whether working or not at a glance It can realize the bidirectional conversion of 3V-5V level of UART, IIC, 1wire, SPI and other bus signals This product a level conversion module, not a power conversion module! ! Must connect to a 5V power supply to work normally. Specifications: Size: approx1.5x1.5cm/0.59x0.59in Channel: 4 Channels 3.3V-5V 5V-3.3V Bidirectional Type: Unwelded Row Pins/ Welded Row Pins Wiring instructions: LV- (1-4) I/O 3.3V TTL-, HV- (1-4) I/O 5V TTL- LV- (1-4) and HV- (1-4) bidirectional mutual rotation Note: 1. If the power supply in the high-voltage area and the low-voltage area have a common ground, the GND in this module only need to connect to one ground. 2. The conversion module equivalent to a straight line, and each port has a one-to-one correspondence, but the voltages on both sides are different. So as to realize the communication between different levels. 3. This module cannot be used as a voltage stabilizer or transformer-. It can only be used for small current communication between IO port levels. Package includes: 1 Set x 4-way Level Conversion Module