4 Hours of Music:  Built-in 25,000W rechargeable battery for up to 4 hours of music at a time, so your party won't be suddenly interrupted. You can charge these wireless speakers via the charging cable when the battery is low. It has SounaviC-TWS technology with which you can link this speaker to another that has the same technology, you can buy two and link them to your same cell phone wirelessly without cables getting in the way. You can tune in to your favorite FM stations  40 MM INCREDIBLE SOUND : This wireless speaker has a high-precision 40mm speaker, intelligent noise reduction technology allows for 100% high-definition transmission. Its voice suppresses 80% of ambient noise for high-quality sound, extraordinary clarity and detail, and maximum freedom of wireless enjoyment.  BLUETOOTH V5.0:Bluetooth technology that reaches up to 10 meters so you can have freedom of movement at your parties and you can change songs from your cell phone with the palm of your hand. The portable bluetooth speaker means easy to change and stability. The problem of wired Bluetooth speakers has been eliminated. 5-button control, including play / pause, next track / volume up, previous track / volume down. You can mount this speaker on an included tripod for a better sound feeling and enjoy your parties with your friends and family. With the included microphone you can perform Karaoke with your favorite songs, it has a rechargeable battery, remote control Charging Cable.  Easy to transport, since it has wheels included.   ENJOY GREAT COMPATIBILITY : Wireless Smart Speaker for PC, iPad, iPhone, Android, Mac, Computer, Notebook, TV, MP3 with Wireless Bluetooth. USB, Micro SD input, FM Radio, 3.5 mm Auxiliary Input, 6.3 mm Auxiliary Input  SPECIFICATIONS : Power: 100-240 Vac 50-60 Hz 30 W RCM power: 30 W (RMS) P.M.P.O. power: 25,000 W Rechargeable battery: 7.4 Vdc 1,800 mA Woofer: 15" (38.1 cm) Impedance: 4 52 LED Light Technology Frequency response: 40 Hz - 20 kHz Bluetooth version: 4.2 Bluetooth range: up to 15 meters tested in an unobstructed line, under optimal conditions Volume Level Battery life 25% Volume 4 hours 50% Volume 3 hours 100% Volume 2 hours