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

Very simple installation instructions and pairs with existing yale system very easily. It does what it is suppose to do :).

These work fine but its almost impossible to change the battery without damaging the unit. The plastic holding in the battery tends to chip off.

Decided to buy extra sensors to put on all the downstairs windows, easily mountable with the included sticky pads (so no holes drilled in my nice new window frames). Easy to pair with the system and works reliably.

Great product at an amazing price.

good

This thing makes my alarm go off when the door is opened. That was why I bought it.

Rather expensive for what you get. However, easy to add to my existing system and the adhesive pads I was worried wouldnt stick were actually very good.

broken weeks after I got it i opened it to check battery wasnt loose as alarm was saying battery low so I was checking all batteries and the spring on the sensor came of leaving item unusable

It is as described. Quick delivery

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