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

Good quality product

Easy to install

Did it not work because of itself or the rest of the system - dunno - I couldnt be bothere pursuing the reason

Absolutely fine

Makes setting and unsetting very easy.

Easy to install and pair with the alarm panel. Quite a generous allowance between the reed and the magnet (25mm+).

Very easy to pair with the system and easy to fit.

Worked great for around a year and then kept setting the alarm off in the middle of the night despite the door being closed. During this time the door was showing as being opened when it was in fact closed; obviously an issue with the contact itself. Yale online support were slow and useless - its been over a week and i still havent heard back from them. Ive attempted to replace the battery but the design of the battery holder makes adding/removing a battery problomatic and the new battery simply doesnt fit in the device and the device no longer works.

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

Added on easily and works as expected