Description: This relay control module adopts ultra-compact optocoupler, which features strong interfence and stable performance. Performing well in circuit and voltage protection, this This relay control module can make electronic devices much safer to use. It is constructed of PCB material. The length of this relay control module is 5.1cm and width is 5cm. This relay control module is suitable for many electronic devices. Item Name: Relay Board Material: PCB Model: YY-30 Style: 5V, 12V, 24V(Optional) Output Capacity: AC 250V/30A, within DC 30V/30A Terminal: 9.5mm Binding Post: 30A Features: Safe, Professional, High Precison Size Details: 5.1cm x 5cm/2.01" x 1.97" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Module Interface Description: DC+ : Positive Pole of External DC Power Supply DC- : Negative Pole of External DC Power Supply NO: The relay is normally open, the relay is suspended before it is closed, and it is short-circuited with COM after it is closed COM: Relay Common Interface Package Includes: 1 X Relay Board This relay control module adopts ultra-compact optocoupler, which features strong interfence and stable performance. Performing well in circuit and voltage protection, this This relay control module can make electronic devices much safer to use. It is constructed of PCB material. The length of this relay control module is 5.1cm and width is 5cm. This relay control module is suitable for many electronic devices.