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

Works, but it is a shame they are so chunky

Good product

Works just as it should and comes with lots of mounting options. Perfect

good

do the job

Good product and fast delivery

Paired easily with current Yale alarm

Replacement so know what to expect

Foot buy

works perfectly and so simple to install