OLYMPUS LS-100 USB PC Interface PCM Recorder Recording Format: Linear PCM (WAV) /MP3 Recording Media: 4GB internal memory or up to 64GB optional external memory Connector: 3.5mm Mic jack 3.5mm Line in jack XLR/Phone jack Ear jack Speaker: Built-in 23 mm round dynamic speaker Battery: Lithium-ion rechargeable battery x1 Battery Life: Approx. 12 hours 30 minutes (Lithium-ion battery) External Power Supply: AC adapter A514 (Bundled) Specifications: Frequency characteristics (Internal microphone): 20Hz~20kHz Phantom power supply: 48V/24V Maximum headphone output: 10mW + 10W (at load of 16O) Maximum speaker output: 480mW (Speaker 8ohms)