OLYMPUS Voice Trek V-13 I confirmed that it works, and I was able to record and play back without any problems. Batteries not included. Body only. USB connection compatible type [Product Description] From the product page Recording file format: WMA, Frequency characteristics (L): 50Hz, Frequency characteristics (H): 13000Hz Memory capacity: 0.256GB, Supported memory cards: None Number of built-in microphones: 1, Microphone movement: Not supported, Directivity switching: Not supported, External microphone: Supported Low cut filter: Supported, Noise cancellation: Supported, Automatic recording: Supported USB direct connection: Supported, Battery type: AAA x 1, Battery life (recording): 21 hours, Battery life (playback): 13 hours Product size: 1 x 3.7 x 9.5cm Product weight: 46g Please refrain from purchasing if you are nervous about used items. No returns or refunds accepted.