Yale EF-DC Easy Fit Alarm Door/Window Contact, White, DIY Friendly, Accessory for SR & EF Alarms, Suitable for Main Access Points

likeit

Easy to instal, and pair with my existing system.

these addons to my system were easy to fit and work perfectly as does the whole system would recomend

Really easy to set up and works just as expected. Its cheaper on amazon than anywhere else and that includes the cost of one day delivery if youvhave prime.

Works like a charm. Easy to add to existing system

the glue could be stronger on the frame sticker, but other than that works fine..

do the job

Easy to fit and great price!

Easy to install and link into existing system

very good