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Extra Long Battery Life And Versatility: The Voice Amplifier has a built-in high-capacity 1800mAh rechargeable Li-Ion battery that provides 10 to 12 hours of amplification and 6 to 10 hours of music playback on a full charge. Mute function: The sound output is set to mute state, that is, no sound is emitted. This is achieved by turning off the audio equipment, adjusting the volume to zero, or adjusting the mute switch. It is often used in scenes where sound needs to be temporarily shielded, such as conference rooms, movie theaters, etc. Stable Performance: This is an original voice amplifier with stable performance. The portable headset microphone has a flexible design and can be placed directly to the mouth. It is perfect for anyone who attends events and needs to project their voice. Suitable for teaching, trainers, singers, coaches, tour guides, shopping malls, speeches, yoga, outdoor speeches, etc Bluetooth 5.0: S617 Supports Bluetooth 5.0. Now connect your phone to Shidu S617 and listen to your favorite. With AUX Input you can now connect multiple devices to convert your Voice Amplifier as a speaker The portable voice amplifier is compact: With compact size and lightweight S617 is very easy to carry. You can use the rear clip to attach it to a belt or pocket. You can also use the belt to attach it to your waist or hang it around your neck