... Sampling rate: 192kbps 44.1KHz Double directional digital high-sensitivity microphone 5 Optional recording types:PCM, SHQ, HQ, SP, LP, ... Hearing Aid function, and listening by earphone during recording Adjustable microphone boost with 7 levels Line in recording and Telephone recording ... SpeakerDimensions: 83*35.5*12.5mm,Weight:40g Dimensions of external microphone: 15*35.5*12.5mm Built in 300mAH Li-ion ...