JB.lab ENERGY Portable Bluetooth Speaker with masstive battery to charge

• Maximum 75W Powerful Sound
• Dual Metal Passive Radiator Sub Woofer
• High-capacity battery (4000mAh)? Playing music for 30 hours
• SNS voice guide app supported ? JBLAB Reader developed by JB.Lab reading messages in voice
• Cylindrical design
• 3Step indicator