Olympus DS-2500. Maximum recording time: 303 h, Recording modes: SP, Audio formats supported: DSS. Display: LED, Display resolution: 128 x 108 pixels, Display diagonal: 44.2 mm (1.74 "). Output power: 235 mW, Loudspeaker diameter: 23 mm. Interface: USB. Battery technology: Alkaline, Compatible battery sizes: AAAA, Recording battery life: 50 h