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This module conform international safety standard, the isolation groove between control areas and load area; With optical coupling isolation, triggering more reliable, more stable; This relay can be used for Arduino; Can be used as a microcontroller development board module; Can be used as a home appliance control . Technical Specifications: Relay Module: SRD-05VDC-SL-C Channel: 1 channel Working Voltage: DC 5V Normally Opened Compatible Load: 10A 250VAC / 10A 30VDC Power indicator (green), relay status indicator (red) Module Size: 50mmX26mmX18.5mm /1.97X1.02X0.73inch(L*W*H) Module interface: Input part: DC+:connect to power positive (according to the relay voltage range) DC-: connect to power negative IN: relay module trigger pin (high or low level trigger Optional) Output part: Normally Opened (NO) : normally open pin of relay. NO pin is not connect to COM pin when relay off.NO pin is connect to COM pin when relay on; Common pin (COM) : Common pin of the relay; Normally closed (NC) : normally close pin of relay.NC pin is connect to COM pin when relay off.NC pin is not connect to COM pin when relay on; high/low level trigger: 1. Low level trigger when jumper and L short circuit; 2. High level trigger when jumper and H short circuit. Package includes: 5 x One Channel Relay Module with Optocoupler Module