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This is a 4 channel relay module. It can be used to control the lighting, electrical and other equipments. The modular design makes it easy to expand with the Arduino board or other MCU board PIC, ARM and MSP430. The Relay output state by a light-emitting diode.
Specification
Drive current: 20mA
Control signal: 5V/12V/24V TTL level
Maximum switching voltage: 250VAC 30VDC
Dimension:50mm*70mm*15mm
