30pcs 1 Channel 12V Level Trigger Optocoupler Relay Module For Arduino

Feature: 1 channel relay module, with photoelectric isolation High or Low level changeable(by a jumper setting trigger) The module uses genuine quality relay With power and relay acof earth wire GND: Ground Notice: High Level Mode: the jumper is set between com and gnd (original). Low Level Mode: take down the jumper, connect VCC to VCC, GND to Control Terminal, IN to 5V, COM to GND. Package included: 30 x 12V 1 channel relay module