Battery operated - three x AA. Low battery, peak level and fault warnings. Audible and visual alarms. Test/retest button. Wall-mounted. Continuous digital display. Backlight. Size: Diam.13.5 x D3.7cm
CommentsGood points: Alarm triggered within three minutes and noise level was over 85db during testing. Small and discreet. Tricky to close cover without batteries which is a good safety feature. Thorough instructions.Drawbacks: Wall-mounted only.