4 channel 5V relay module low trigger with optocoupler

Specification: Brand new Size: approx. 21.5*11.8*22.7mm Operating Speed: 0.12second/ 60degree ( 4.8V no load) Stall Torque: 1.2kg / 42.3oz(4.8V); 1.6

Description: Mega 2560 Arduino follows Open-source principles, which means you can freely download the development environment and many associated resources.