Features: When the headphones are not plugged in, turn the power button to "ON" position. The red and blue lights indicate the battery level, and the red light flashes three times to enter the recording modes. With the headphones plugged in, turn the power button to "ON" position to start playing recording or MP3 music files, and the blue indicator light will continuously flash. In the recording state, turn the power button to "OFF" to save the recording. All works is turned off, and the power is now disconnected. Recording format WAV, music format MP3, WAV, WMA Recording Time:192hours Specifications: Material:Metal The battery recording time is about 10 hours Recording compression ratio 192Kbps Sampling rate 48KHZ Frequency 20-20KHZ Battery Capacity:60mAh Size:Approx.37mm/1.46''x14mm/0.55'' Connect the included data cable to the computer USB; At this point, the computer will poping up a removable disk, open the disk, find the RECORDfolder inside, copy the WAV format audios files inside to the computer, and complete the recording file copying work; Then you can use the music player to open the recording file for playback Note: Please allow 1mm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x Voice Recorder