Built-in 5200mAh (2*2600mAh) rechargeable battery with up to 15 hours of usage time. It can fulfill your long time lecture teaching or presentation needs. With the size of 4.92 * 3.94 * 2.28 inches and weight of 1.03 pounds, the mini microphone and speaker can be carried easily.
The personal voice amplifier also supports TF card, USB, and AUX audio inputs, and supports the connection of a 3.5 mm wired microphone for use. The better sound quality is great for use in lectures, teaching, presentations, meetings.