Features: 16CH Relays 12V Module with Optocoupler Low Levels Triggers is compatible board with 16 relays for AC50V / 5A or DC30V / 5A is perfect for all kind of projects. This 16-channel relays module with optocouplers is perfect for driving up to 16devices with higher current. The optocouplers on 16 Relays 12V Module serve to transmit the signals between the two galvanically isolated circuits. your connecting device with a higher current. In addition, a LED display is integrated to read the relays output status. 16-Relays 12V Module with Optocoupler Low Levels Triggers is equipped with high current relays which can be controlled directly by the microcontroller. Standard interfaces can be directly connecting with microcontrollers. Specifications: Material:ABS Working voltages: 5V/12V/24V Channel: 16 channel Package Includes: 1Piece 16 Channel Relays Module note: Please allow 1mm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual color.