Solu HB100 Microwave Sensor Module 10.525GHz Doppler Radar Motion Detector Arduino//HB100 microwave Doppler Wireless Radar Detectors Velocity Sensor Motion Sensor About us, Professional factory of circuit boards for Arduino, welcome to our store for more choices with best price. What we pursue is your satisfication of our service, not just for our goods.For any reason you are unsatisfied with our product at any time, simply contact support for exchange or refund. we will reply you about any question you ask within 24 hours HB100 microwave modules use the Doppler radar (Doppler Radar) design principles of the microwave moving object detector it mainly used in automatic door control switch, security systems, ATM ATMs automatic recording control system, automatic train signals etc. HB100 is the standard 10.525GHz microwave Doppler radar.Frequency Setting Accuracy: 3MHz Usually, you will get it actually in 9~19 days, If you are in the USA and the item is NOT Fulfilled by Amazon. the item will be sent to you by USPS with shipping information from China. The estimated delivery time offered by Amazon is not the real time. Your patience is highly appreciated. Hope you will receive your item soon and enjoy using it.