... , No need Bluetooth, Wi-Fi, configuration, cable, connector .2.Sterling audio in a super-compact design Mini, portable amplifier ... go. 4. Unique design 5 Supports IOS devices and android devices 6. low energy consumption but high efficiency 7.SupportTF ... ratio>80dBTHD:<0.5%Frequency range:20Hz to 20kHzSpeaker40mm *2 anti-magnetismbattery2200mAh Re-chargeable LithiumDimensions122*60*47mm Net weight: ...