This is a 5V 2-Channel Relay interface board, Be able to control various appliances, and other equipments with large current.A relay can be used to control high voltages with a low voltage by connecting it to an MCU. The 2 relays on the module are independent of each other, once a relay is triggered by the low level, the corresponding LED lights will be lit and accompanied by a crisp sound.
It can be controlled directly by Microcontroller(Arduino , Raspberry Pi, 8051, AVR, PIC, DSP, ARM, MSP430, TTL logic).
More details can be found in https://www.sunfounder.com/wiki/index.php?title=2_Channel_5V_Relay_Module
* 1 x 2 Channel Relay Module
5V 2-Channel Relay interface board, and each one needs 15-20mA Driver Current
Equiped with high-current relay, AC250V 10A ; DC30V 10A
Standard interface that can be controlled directly by microcontroller (Arduino , 8051, AVR, PIC, DSP, ARM, ARM, MSP430, TTL logic)
Indication LED’s for Relay output status
Link to download the document: http://www.sunfounder.com/wiki/index.php?title=2_Channel_5V_Relay_Module