Noise Reduction Design: With noise reduction technology and high-sensitivity microphone, it can restore the original sound for ultra-clear recording without headphones and provide exceptional sound quality One-Button Recording & Keychain Design: It features one-button recording, making it easy to use. The keychain design makes it easy to hang to your belt to carry around Easy to Transfer Recordings: Convenient to transfer the recordings to a computer/mobile phone to playback, delete and rename the recording files MP3 Player: Comes with a wired headphone, plug in the recorder, making it turn into an MP3 player to enjoy music Practical Gift: A useful gift for students, professors, teachers, businessmen, and anyone who needs to record usually Wide Application: It's ideal for lectures, meetings, interviews, speeches, class, business, and study Specification: Product weight: 46.3g Product size: 76.28*8.7mm Battery capacity: 130mAh Recording time: 26 hours Charging time: 1.5 hours Playback time: 10 hours Internal memory: 4GB Speaker: Built-in Recording format: WAV Playback format: MP3/OGG/APE/FLAC/WAV/AAC-LC