Note: Turn the detector onto the mounting plateand then hold down the test button. The device will then emit the test tone indicating perfect function (read the user manual for a better experience) No LED links: without annoying acoustic or visual indicators in normal operating mode, the detector is particularly suitable for use in bedrooms and children's rooms German version: this product is only suitable for German-speaking countries, as the instruction manual is only included in German Box contents: 1 x smoke detector, including manual, screws and dowels as well as a built-in 10-year battery, 119.5 mm diameter, 1 x 185 g