SONY ICDBX140.CE7 Digital Voice Recorder Recording Format: MP3 Recording Media: 4GB Speaker: Built-in speaker 300 mW Battery: 2 x AAA - Alkaline Specifications: Built-in Display: LCD Microphone: built-in - mono Data Storage Capability: Up to 495 files / 99 folders Dimensions: 4.54 x 1.52 x 0.84 (H x W x D) Weight: 0.16 lb.