16GB writable voice recorder HD recording One click operation intelligent voice-activated multi-function recorder

Recording mode: One-click recording
Recording format: MP3,WAV
Recording time: 21 minutes
Memory card type: SD card
Display: No screen
Transmission interface: USB 2.0
Number of microphones: one-way
Video: Video shooting is not supported
Battery: Lithium battery
Case material: metal
Product size: 140mm*17mm*14mm