This is a 5V 8-Channels Relay module,...
This is a 5V 8-Channels Relay module, It can be controlled directly by a wide range of microcontrollers such as Arduino, AVR, PIC, ARM and MSP430.
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8 relays are included in this module, with “NC” ports means “Normally connected to COM” and “NO” ports means “Normally open to COM”. This module also equipped with 8 LEDS to show the status of relays.
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9.1 x 7.2 x 2cm