20changing them! Always test the alarm immediately after returning from holiday or after alonger period of absence. Under the test button, there is a red activity LED. When thisLED is enabled (see page 7) it flashes about once every minute. This shows that thebatteries are correctly connected. If the alarm does not sound when testing, the batteriesmust be replaced. The alarm should be dusted and cleaned regularly with a slightly dampcloth. In connection with annual battery change or when required, for example after a falsealarm, clean and vacuum the alarm carefully using a soft brush.CAUTION: Do not paint the alarm.The batteries last approximately 24 months. About a month before the batteries arecompletely flat, the alarm emits a short chirp once a minute. This is the signal that thebatteries need changing. The alarm works as normal during this time. The batteriesshould be an alkaline 1.5 Volt AA size. Use good quality batteries: Duracell ProcellMN1500 or Eveready Energizer EN91. Always test the alarm after changing the batteries.Notes:1. Wait 60s between removing the old batteries and inserting the new batteries.2. Do not pull on the catches between the batteries to try to force them out.3. Do not try to close the battery compartment without the batteries present. The productis designed to prevent this.ServiceIf the sounder chirps once every 10 seconds and the activity LED is flashing once a sec-ond then a fault has occurred. Remove the old batteries, wait 60s, and then fit newbatteries. Check that the activity LED is working normally.