2-Channel Signal Relay Module for Arduino UNO MEGA2560 R3 Raspberry Pi
http://www.yasurs.com/yasurstm-2-channel-signal-relay-module-for-arduino-uno-mega2560-r3-raspberry-pi.html
2 Signal RELAY Interface definition: IN(x): High level. Low level cut-off This item has been assembled, Led indicator for each relay.
















