This Smoke Alarm with Built in Audio Voice Recorder (Voice Activated). The SAVR has an extremely long standby battery life of up to 250 days when in voice activated mode. This Smoke alarm voice recorder is perfect and with its high sensitivity microphone it can pick up conversations up to 10 metres away. The recorder is very simple to use and is operated by a single switch. Time and Date Stamp on recordings. Rechargeable Lithium Battery.