Features: The R4ROM01 Mini RS485 Relays Board offer unparalleled compactness and low noise operations, making it for integration into various equipment and systems. This Relays board supports multiple working voltages (DC5V/12V/24V) and features six command functions including "Open," "Close," and "Delay," with delay of 255 seconds. for enthusiasts and professional, this Relays board for those involved in home automation, security monitoring, and electronic switches projects. for applications such as PC remote Controls, PLC output expansion, and LED Controls, the R4ROM01 fit effortlessly into small space thanks to mini size of 40 16 14MM and lightweight. with support for up to 64 devices under MODBUS command and load capacity of 3A/250VAC or 3A/30VDC, this Relays board ensures Performances across diverse projects. Specifications: Materials: ABS Size:40x16mm/1.57x0.63inch Styles: 5V, 12V, 24V(optional) Note: Due to the screen setting difference, the item color may slightly differents from the pictures. Please allow slight dimension difference due to differents manual measurement. Package includes: 1PC RS485 Relays Module