Voice Amplifier Multifunctional Portable Personal Voice Speaker with Microphone Display Surround Sound for Teachers Speech Feature: This Voice Amplifier is a multifunctional portable loudspeaker with sound-amplifying, digital music playing function. Imported high-power amplifier chip and advanced off-fidelity amplifier master control. Using high-power speakers, this sound effect is clear and loud, covering a wide range of transmission. High capacity, high safety, class A 18650 lithium battery. Note: 1. In order to achieve the best sound amplification, place the microphone head 1cm in front of the mouth and speak at the microphone head; 2. If there is a howling, please turn down the volume and pull the machine and the microphone away to prevent interference; 3. It is recommended to charge the battery after using up. If it is not used for a long time, it should be charged once a week. Specification: Output power: 12W Charging voltage: DC 5V 1A Use music time: 6-8 Hours Frequency response: 50Hz-15000Hz Working temperature:-10~45 Use of amplification:6-8 Hours Charging time: 4 Hours Package Include: 1 x Black Voice Amplifier 1 x Wired Microphone Headset 1 x Waistband 1 x USB Cable 1 x User Manual _x000D_