Model: Q37Number of microphones: two-wayRecording format: WAVGift-giving purposes: business negotiation, public security work, negotiation recording, interview records, meeting records, corporate training, school classes, learning English, listening to music, family careProduct Weight: 11Transmission interface: USB 2.0Maximum number of recording files: 999Recording mode: HD noise reductionVideo recording: Video recording is not supportedDisplay: no screenRecording distance: 5-10 metersMemory card type: Expansion card is not supportedApplicable people: business people, public security personnel, lawyers, reporters, clerks, training lecturers, students, security personnel, family caregivers, security personnel, security personnelShell material: CNC aluminum alloyCapacity: 4GB, 8GB, 16GB, 32GB