Button defective

* Model: Kidde 8LLDCO
There are the CO alarm for operation with replaceable batteries (3x AA): Kidde 7DCO
Models without digital display in each case without "D"

* Guaranteed lifetime of the unit for 10 years from start-up (under normal operating conditions). Exchange of the lithium batteries is not possible.
Production date is given as additional information.

* Start-up is carried out by pushing the unit to the mounting plate. After that you can not turn it off temporarily. Use as wall or desk unit.

* Initial test and weekly tests of the device via the "Test / Reset" button are recommended. "Peak" button displays the previous record (11-999 ppm) since inception or last zeroing.
The current CO value will be displayed from 30 ppm. Sensor measurement (sampling) is performed every second, the display update every 5 seconds, a value is determined on the last 15 seconds.
Accuracy of display: ± 30%

* Shutdown current alarm over the "Test / Reset" button. Then device operates normally.

* In normal operation the green LED flashes every 30 seconds, the display shows "0", the point will flash every 5 seconds.

* Deactivation of the device occurs at the end of life (either after 10 years, indicated by acoustic and LED signal, or in advance of final decommissioning) manually by moving a hidden switch on the back. The unit will then no longer signals from, and discharges the remaining battery power.

- In my unit, the "Test / Reset" button was jammed and did not press, so I have to dispense with a startup

- Links to the German operating instructions and other technical information (in English) I give in the comments

- Kidde is a US company (part of United Technologies, USA), whose brand Fyrnetics is apparently often used in GB. Companies sided information 8LLDCO moment you will find only on the British Kidde website (which is the least designed specifically amateurish)

- The valuation deductions's for the defective key and the inability of a holiday shutdown when further data recording (by about neighbors in false alarms unnecessarily torturing), although I can understand security concerns in the latter and also other that have not (but there can be at least remove the batteries)

Addendum: Kidde mid-2013 brought a slightly modified successor, the Kidde 10LLDCO (or 10LLCO without digital display). The difference is next slightly larger keys and a separate living end / fault LED in an extra testing mode, which changes the 15-second averaging to respond immediately to sprayed for testing CO, as it wanted some buildings installers as quick test after installation. After the test, the device will then revert back to normal operation.
In addition, the unit logged with events that can be read on request from Kidde. These include iw the number and type of events, life of the unit and the values ​​of the last peak measurement:
No of on / off events
Last peak event, ppm & Date
No of peak events since activation
Any fault events
No of days since activation