The WinBridge WB001 Voice Amplifier is a portable, rechargeable device designed for amplifying sound with its built-in headset mic. With an output power of 5W and a lithium battery that provides 5-8 hours of working time in musical mode or 3-8 hours in MIC mode, this amplifier is ideal for presentations, speeches, or music performances. Weighing only 138g and with a sleek design, it is easy to carry around and use on the go. With a charging time of 3-5 hours, this amplifier is a convenient and versatile tool for any event.