Speakers - Universal - Portable Music Wireless Bluetooth Speaker MP3 Player Super Large Metal Subwoofer | Bookshelf Speakers (Black) Highlights Universal Wireless Bluetooth Speaker with Portable Music MP3 Player Super Large Metal Subwoofer | Bookshelf Speakers (Black) Wireless Bluetooth Speaker with Portable Music MP3 Player Super Large Metal Subwoofer | Bookshelf Speakers (Black) Features 1. Drive Capacity: 2000MAH 2.Buetooth version: CSR 4.0 3. Music Time: 6-12h 4.Standby Time: 20 days 5.Transmission Distance: 10m 6. Voice Response frequency: 20Hz-20kHz 7.Paseur: 4 8.Snr: 90DB 9.Perification voltage: 3.7V 10.Distortion: < 1% 11. Input voltage: 5V / 1A Output voltage: 5V Output power: 3W Working voltage: 3.7V 12. Support USB / Micro SD: 32G (max) 13. Size: 72x 72 x 82 mm 14 . Black color