... sound quality This is a portable bluetooth speaker with rotate base,Support iPhone,iPad,Smart phone and laptop with bluetooth function.Features :1 ... quality.4.D-level digital Amplifier chip,Ultra low power.5.Easily be connected with Bluetooth device,once connected,it will ... unit:40mm 2.Bluetooth version:Bluetooth V3.0,Class 23.Speaker Power :3W 4.Battery capacity:650mAh 5.Input voltage: 5V DC