The features of 2-Channel Relay module:

Good for safe control of higher amperage circuits. In power systems, the lower current can control the higher one.
2-channel high voltage system output, meeting the needs of dual channel control.
Brand new and high quality.
Standard interface that can be controlled directly by microcontroller (Arduino , 8051, AVR, PIC, DSP, ARM)]
Wide range of controllable voltages.
Being able to control high load current, which can reach 250V, 10A or 125V, 15A
With a normally-open (NO) contact and a normally-closed (NC) contact.
Around the board with 4 mounting holes, easy installation and fixing
It has a common end, a beginning, a closed-end

Specification of 2-Channel Relay module:

Relay Module; Model : JQC-3FF-S-Z, 2 Channel
Voltage to operate: 5V D
Color : Blue Relays on a black PCB
Load : 10A, AC 250V/ 15A, 125V