Check the listing for details. DC 5V 12V NE555 Adjustable Resistance Frequency Pulse Generator Module. Condition: New. Listed at 5.98 USD. Package: 1X NE555 Module Feature: 1. Onboard NE555 IC. 2. Single channel signal output, the output duty cycle about 50% square wave. 3. Plate load resistor, adjust the resistance to control the output frequency. 4. Onboard power indicator. 5. Working voltage: 5V~12V. 6. ​Frequency range: 2K-25KHz 7. Size: 3*1.5cm Contact Us (1) We strive to provide the best service as possible, commit to resolve all problems and give fast shipping. (2) Please contact us before giving any negative feedback. If you have any questions, please do not hesitate to contact us. Payment (1) All payments must be prepaid and cleared. (2) We only accept Paypal payment. After checkout, please make through Paypal service. Shipping (1) Buyer is responsible for any incorrect address and undeliverable address. We reserve the right to charge the shipping fee again for returned items due to wrong address. We take the paypal address as your shipping address. Please make sure your shipping address is correct during check out. (2) Your order will be shipped within 24 hours after payment is cleared (Sat. & Sun. excluded and holidays) (3) We ship orders using USPS (United States Postal Service). The shipment usually takes 2-4 business days, excluding holidays, Saturday and Sunday (4) Local pick up is not available. (5) No International Shipping. Warranty (1) This product has a 30-day warranty. (2) Warranty does not extended to any products that are buyer's negligence, abuse, misuse, improper installation or physically damaged on the buyer or user's part. (3) Please contact us before making a replacement or refund. (4) In case of returning, buyer must pay their own postage and shipping fees for replacement or refund. We will provide replacement or refund after product is received.