This is a 5V 16-channel relay module. It can be directly controlled by a wide range of microcontrollers such as Arduino, AVR, PIC, ARM, and MSP430.
16 relays are included in this module, with "NC" ports meaning "Normally Connected to COM" and "NO" ports meaning "Normally Open to COM". This module is also equipped with 16 LEDs to show the status of the relays.
