30pcs1 Channel 12V Level Trigger Optocoupler Relay Module Geekcreit for Arduino - products that work with official Ard

Feature 1 channel relay module with photoelectric isolationHigh or Low level changeable by a jumper setting trigger The module uses genuine quality relayWith power and relay acof earth wireGND GroundNotice 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