KingNeed GSM Voice Activated Recorder/ Audio Black Box/ Remote Recording by Phone/ Real Time monitor by phone/ IPX7 Water-proof/ Magnet/ 5000mAh Battery Built-in Digital GSM Voice Recorder and black box, built-in SIM card/ micro SD slot/ sensitive microphone/ audio DSP processor/ Magnet 4 recording mode: Voice activated/ Scheduled activated/ Phone activated/ Vibration activated. MP3 / WAV recording format options Phone Controlled: Remote control to start or stop recording/ Real time monitor by phone/ Remote playback appointed time from recorder by phone Long working time, 110 hours continuous recording time and 100 days in 1hours scheduled recording per day, Multi-sleep mode is optional to prolong the working time Support maximum 32GB micro SD cardthe recording file will be auto grouped to the fold which named by date