5pcs NE555 Adjustable Frequency Pulse Generator Module Smart Car

Features: ? 1. NE555 chip onboard 2. A single channel output, the output duty cycle square wave is about fifty percent 3. Onboard adjustable resistance, resistance can be controlled to adjust the output frequency 4. Working voltage: 5 - 12V? 5. Board size: 29 (mm) x12 (mm) ? Package Included: ? 5 x NE555 Adjustable Frequency Pulse Generator Module