Pen Digital Voice Recorder Features: Blind Operation Recording: Ballpoint pen-type mechanical rebound switch, press to start recording (pen cap down), then press again to finish recording and save (pen cap up). Multifunctional: While recording data, the digital voice recorder can record while writing to achieve two-way recording, and can also replace the pen refill as a signature pen. Noise Reduction: Uses an acoustic 8-core DSP noise reduction module, offering some reduction of ambient noise. Connection Upgrade: Connect the OTG adapter to manage and transfer files on your phone; supports Android and iOS phone connection, plug and play, simple and convenient. Applicable Headphones: Connecting headphones allows music and recording file playback; supports in-line headphone control for switching songs, fast-forwarding and rewinding, volume, and confirming and deleting files. Durable Material: Metal alloy material, CNC process manufacturing and baking paint electroplating process for construction; durable, anti-oxidation, and scratch-resistant. Specifications: Item Type: Pen Digital Voice Recorder Material: Copper Alloy Built-in Polymer Lithium Battery: 180mAh Recording Time: 15H Playback Time: 10H Charging Time: 2.5H Recording Format: WAV Playback Format: MP3, WMA, WAV Package Includes: 1 x Pen Digital Voice Recorder 1 x Charging Cable 1 x Earphones 1 x User Manual 3 x Pen Refills