Power: 8W Battry capacity: 4600mAh Charging time: 4h Working time: 2-3 hours Life time: up to 15 hours Playback mode: support USB flash drive playback and TF card playback Tips:It is wired or wireless version.Except for the microphone connection way, other functions are all the same. HOW TO USE: 1. Place the microphone in front of your mouth to obtain the maximum amplification effect. 2. Do not whistle: keep a certain distance between the microphone and the speaker, and preferably facing each other. 3. Put on a headset, hang the amplifier speaker on your waist, then turn it on, and finally gradually increase the volume as needed. Colour:White Material:plastic Specification:A:Wireless Package Contents: 1 x Voice amplifier 1 x Headset microphone 1 x USB cable 1 x Waist Belt 1 x Wireless Receiver 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.