1、Dual Recording Mode: The mini recorder supports one key recording and remote control operations, making recording easier. 2、Use of Recording Lessons: Digital recorder with playback function, which can play back the recorded course audio, a good helper for learning. 3、Large Battery Capacity: Fast charging only takes 1 hour, recording time up to 20 hours, and playback time up to 15 hours. 4、Portable Size: This small size of the mini recorder has professional level recorder parameters to meet daily recording needs. 5、Core Functions: One key noise reduction, power off protection, file encryption, intelligent voice control, local deletion, mp3 playback, etc. Item Type: Recorder Model: Q37 Material: Aluminum Alloy Size: Approx. 34 x 34 x 7.9mm / 1.34 x 1.34 x 0.3in Battery Capacity: Built In Lithium Battery 120mah (Shipped with Built In Battery) Recording Mode: One Key Recording, Wire Control Operation Recording Format: WAV, MP3, WMA Memory Card Type: Does Not Support Expansion Cards Transmission Interface: USB 2.0 Recording Distance: Maximum Support 10m / 32.8ft Charging Time: About 1 Hour Playing Time: About 15 Hours Recording Time: About 20 Hours 1 x Recorder 1 x Headphone 1 x Charging Cable 1 x Instruction