1. Smart Ducking Function, To Adjust Treble / Alto / Bass,7 Types Special Effect,Original-Sound Remove,Electronic Sound Setting 2. Power Battery With 4000mah Capacity,Battery Life In 5hours For Normal Use 3. Fit For Some Of Equipment,With Bluetooth (Cellphone, Pad Tv) 4. Adiustable Volume 5. Fit For Studio And Live Wireless Microphone Charging Time:2-3h Bluetooth Parameters:BT5.0 Wireless Microphone Distance:10-15m Bluetooth Distance:10m Speaker Parameters:4x8W Product Battery Specification:7.4V/4000MA Product Charging Time:3-6h Product Play Time:3-4h Charging Parameters:5V/2A Main Functions:Bluetooth/TF Card, Listening To Songs, Singing, Live Broadcasting, Recording Songs, Voice Changing, Special Effects, Reverberation. Note:Different Batches May Have Differences In Product Appearance, Color, And Printed Characters, Which Not Affect The Use Colour:As Shown Material:ABS+Plastic Size:About 325x143x84mm Package Contents: 1 * 3.5 Accompaniment Cable 1 * 3.5 Live Broadcast Cable 1 * Charging Cable 2 * Wireless Microphone 1 * Receiver 1 * Earphone 1 * Strap 1 * English Manual 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.