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

does what it is supposed to do. Easy to fit.

Excellent piece of kit

Very good

Bought YALE alarm kit - needed extra door/window sensors. Worked perfectly - was up and running within minutes.

Addidional kit. Slotted straight in. Easy to use and set up. Pleased.

Perfect

OK and with just about enough range to cover a shed 20 metres away. Easy enough to add to system.

great

Foot buy

Very easy to install and fit against the door to allow the alarm to work. The batteries are very easy to change with small screws to come undone allowing the top to come off without it being removed from the door. I find it very handy that it allows you to press a button to check whether the battery is still working and not dead.