Voice Activation Recorder : Features smart One-button control design, the voice recorder allow you to start and save voice activated recording or normal recording quickly. Just push the button to the recording mode you need to start quickly recording. In voice activated recording mode, device will automatically start recording when sound is detected and stop when no sound, this making full use of the built-in memory capacity.Long Battery Time & Large Capacity : The sound activated recorder features built-in rechargeable battery, which can support 85-100 Hours of continuous recording time after being full ch arged-Fully charge time: need 2.5-3 Hours. This small recording device comes with a 4GB build-in memory which can save 48 hours recording file at 192kbps.HD Sound Quality & Extension Functions : The voice activated recorder adopts latest intelligent noise reduction DSP chip, which will produce HD sound quality recordings. This little sound recorder also supports automatic saving of recording files when the battery is low or shut down, but please turn off the device to ensure the recording file save successfully before playback. And the "recording while charging" function will be a great extension function for your daily needs.Playback WAV format Recording File : 1,Support playback thought device-need earphones and black cable with buttons, all included in the package. 2,Playback on Computer-please use the original data cable, Windows system, we suggest that use the "Windows Media Player", Mac system, We suggest that use the "VLC Media Player". 3,Playback though Android Phone-please use original data cable & the OTG connector, only support android phone.Multipurpose : This voice-activated sound recorder can adsorb to any surface made with iron , making the recording easily. With time stamp function, all recording files are named by date and time format, which is convenient for daily management. This digital voice recorder also can be used as an MP3 Player / USB Drive, ideal for lectures, meetings, interviews and more. IMPORTANT 1,Please set device date and time(set up timestamp) though computer before first use and you need set every time when battery runs out. 2,Must use the player which can support WVA format recordings. 3,Please use original USB cable when connect to computer or android phone.4,Some software are EXE format which not support by Mac computer, please run on Windows computer