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with motion activated cameras, two-way audio and ir night vision technology if our products fail to meet your expectations, please feel to contact us , and we will contact you within 12 hours and help you solve any problems "quality first, customer first" is our business philosophy. you will be alerted whenever motion is detected. the sensor is adjustable and equipped with infrared light. the company focuses on the sales of tachograph, motion camera, intelligent visual doorbell, webcam, children's camera and other products.syi