Description:   Specification:   Output power: 12W   Charging voltage: DC 5V 1A   Frequency response: 50Hz-15000Hz   Working temperature:-10℃~45℃   Use of amplification:12Hours（The volume is 60%）   Charging time: 4 Hours   Battery capacity: 1200mah   Size: 88*88*42mm   Net weight: 232g   Expanded memory: 32GB (maximum support)   Specifications:   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.   Package Included:   1 x Black Voice Amplifier   1 x Wired Microphone Headset   1 x Waistband   1 x USB Cable   Notes:   Due to the difference between different monitors, the pictures may not reflect the actual color of the item.   Compare the detail sizes with yours, please allow 1-3cm error, due to manual measurement.   Please leaving a message before you give the bad feedback, if the products have some problems.   Thanks for your understandings.