Dual SPDT Relay Board for Microcontrollers, Opto Isolated 5VAdditional Notes:* Opto Isolated input, Dual Relay module for any project. Easily driven by an Arduino,other micro controllers or any external trigger source.* Freeware available through www. arduino.cc.en & others* LED indicatorsfor input activity.* Ground on Input Actuates Relay* Power: 5VDC @ 80mA/channel energized* Jumper Select either Power from CPU or external.* Input: .1in. Pitch header with Vcc, Gnd, and inputs.* Input Signal: Ground energizes relay(s)* Output: Terminal strips* L: 2 W: 1-1/2 H: 3/4MPJA32442 MP