1,8 Channel Relay: This is a single 8 channel relay module, 8 channel external control output and low battery can effectively control switches or sensors, etc. 2,Internal Circuit Protection: The relay control module supports internal circuit protection, safe and reliable to use 3,Stable Performance: The relay circuit board has precise wiring, provides stable performance, practical, easy to operate and use 4,6 Instructions: This relay module has 6 instructions, which is open, close, momentary, self locking, interlock, delay 5,Strong and Durable: This relay module with ABS shell is sturdy and not easy to be damaged, you can use for a long time without worries Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.