This digital voice recorder is capable of recording for continuous 21 hours clearly and hard to be perceived due to pen shape. And it can connect to a phone through OTG transferring for storing and transmitting voice files. Furthermore, 8G memory enables it to record as many sounds as possible. Features: Pen Shape - Pen appearance makes it look like a real pen, which is hard to be perceived. One-button Recording - To record sounds with just one button. Very convenient. 8GB Memory - A large memory up to 8GB enables this digital voice recorder to record as many sounds as possible. 21-hour Recording - To record sounds for 21 hours continuously. Phone Connection - Connect with a phone through OTG transferring function. Time Stamp - Adopting time stamp function to arrange files orderly for easy finding. Specifications: Product type: Pen Shape Digital Voice Recorder Recording time: 21 hours Recordin format: WAV Memory: 8GB memory Recording mode: One-button recording Sampling frequency: 48KHz Time stamp: Support Battery: Built-in polymer battery Supported system: For Windows/iOS systems Package size: approx. 17.5 * 7.5 * 4 cm/ 6.9 * 3.0 * 1.6 in Package weight: 145g/ 5.1oz Package List: 1 * Pen Shape Digital Voice Recorder 1 * User Manual 1 * Data Cable 1 pair of Earphones 2 * Replacement Cartridges