4 Channel 12V Relay Module – High-Level Trigger for Arduino by ADIYDESCRIPTION Relay module with 4 onboard relays. Each relay can switch devices with current up to 10A. Optical isolators are included in the circuit to protect your driver device from a reverse voltage surge. FEATURES The module can be controlled directly by Microcontroller (Raspberry Pi, Arduino, 8051, AVR, PIC, DSP, ARM, ARM, MSP430, TTL logic) Easy to install and fix Optically Isolated relays to protect your microcontroller from damage if the