Check the listing for details. 3X NE555 Timer Module Pulse Output Adjustable Frequency Board Wave Generator USA. Color: Blue, Condition: New. Listed at 14.89 USD. Features:1.This product is made of high quality ABS material, strong and durable. 2.After the power is applied, the output terminal outputs a square wave signal with an amplitude approximately equal to the power supply voltage. 3.The output frequency is adjustable, and the output voltage is stable during the adjustment of the frequency. 4.The adjustable frequency range is 20HZ-10KHZ, which can be selected according to the need (the frequency is allowed to have 10% deviation). If special frequency is required, the C1 capacitor needs to be replaced. 5.The frequency adjustment is adjusted by the multi-turn potentiometer. Specifications:Material: ABSPower Voltage: DC 5V-15VNo-load current: Approx. 3mAOutput drive current: 200mAApplication: Used as a signal source in the circuit Package list:3 x Pulse Output Adjustable Module Note:Application method:Connect to the power supply to work.When in use, a 0.1uf power supply filter capacitor can be connected to the power supply to stabilize the operation.Adjust the potentiometer clockwise, increase the frequency, adjust the potentiometer counterclockwise, reduce the frequency. On Jun 4, 2024 at 08:49:48 PDT, seller added the following information: