This Voice Amplifier is a multifunctional portable loudspeaker with sound-amplifying, digital music playing function. 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 , class A 18650 lithium battery. 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 Expanded memory: 32GB (maximum support) Note: 1. In order to achieve the best sound amplification, place the microphone 1cm in front of the mouth and speak at the microphone ; 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 once a week. color:White Material:ABS Size:88 x 88 x 42mm Package Contents: 1 x Voice 1 x Wired Microphone Headset 1 x Waistband 1 x USB Cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.