This 5V relay module allows the user to select between active High and active Low configurations. 

• 1 relay on board
• Normally Open (NO) or Normally Closed (NC) operation
• 5V relay requires 5mA driving current
• Each relay is activated by an ACTIVE LOW signal (0V) or ACTIVE HIGH (5V) (selectable by jumper)
• 5V 5mA TTL control input which can be directly controlled by Arduino, AVR, PIC, ARM and others.
• Indicator LED for status
• Relay is rated at 10A@250VAC and 10A@30VDC