3pcs NE555 Adjustable Frequency Pulse Generator Module Smart Car

Features 1 NE555 chip onboard2 A single channel output the output duty cycle square wave is about fifty percent3 Onboard adjustable resistance resistance can be controlled to adjust the output frequency4 Working voltage 5 12V 5 Board size 29 mm x12 mm Package Included 3 x NE555 Adjustable Frequency Pulse Generator Module