https://community.arlo.com/t5/Arlo/Glass-Reflection-vms3330c/m-p/1291025#M35561 <P>Arlo and Arlo Pro cameras which use IR to detect motion do NOT work thru glass...Glass blocks IR</P> <P>&nbsp;</P> <P>Glass will also reflect the IR illumination ....so If you want to only view thru glass it must be turned off at night ( or it washes out the picture )</P> Fri, 26 May 2017 12:40:20 GMT TomMac 2017-05-26T12:40:20Z https://community.arlo.com/t5/Arlo/Glass-Reflection-vms3330c/m-p/1291008#M35560 <P>I have a camera mounted inside my house. &nbsp;Its pointed at my front porch and aims through a big glass window. &nbsp;It rarely sounds an alert even though its within 10' of my front door. &nbsp;Could the reflection of the glass be causing the camera to not send an alert? &nbsp;I have the sensitivity turned up to 100%.</P><P>&nbsp;</P><P>6thanks,</P><P>Don.....</P> Fri, 26 May 2017 12:00:31 GMT https://community.arlo.com/t5/Arlo/Glass-Reflection-vms3330c/m-p/1291008#M35560 dsealer 2017-05-26T12:00:31Z https://community.arlo.com/t5/Arlo/Glass-Reflection-vms3330c/m-p/1291025#M35561 <P>Arlo and Arlo Pro cameras which use IR to detect motion do NOT work thru glass...Glass blocks IR</P> <P>&nbsp;</P> <P>Glass will also reflect the IR illumination ....so If you want to only view thru glass it must be turned off at night ( or it washes out the picture )</P> Fri, 26 May 2017 12:40:20 GMT https://community.arlo.com/t5/Arlo/Glass-Reflection-vms3330c/m-p/1291025#M35561 TomMac 2017-05-26T12:40:20Z