This recorder easy to fit your pocket or wallet to carry around, powered with rechargeable battery. It can be used to record meetings, conferences, lectures, interviews and so on! Equipped with double sensitive microphones, this device records 128Kbps high quality audio messages. It is an excellent tool for teachers, students, salesman, audiences, professors and anybody who need to record what they need. Easy figure out operation buttons, just switch on your voice recorder, "REC", it records your important lecture, moments; "STOP" save your recordings safely; "PLAY" listen what you just recorded, and then A-B, select your important section to repeat, help you study and review your teacher, professor's main speech at class, lecture, semester so simple! Built-in rechargeable Lithium battery provides 20 hours of continuous recording. 8GB memory can store 7680 minutes of recordings which can be saved in several types of data files . which makes this device undoubtedly a , portable and reliable sound recorder. Colour:Black Material:Metal Package Contents: 4 x Voice recorder pen Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.