4 channel 5v relay shield module, Four channel relay control board relay expansion board for arduino UNO R3 mega 2560

Brand Name : TZT Model Number : 4 channel 5v relay shield module Usage : General Purpose Voltage : 5V Origin : Mainland China Theory : Solid State Relay Protect Feature : Epoxy Certification : none is_customized : Yes Hign-concerned Chemical : None For Arduino STM : electronic module