Carrying power: RMS 2W * 2 THD +1%

 Frequency response: 150Hz ~ 20KHz

 Speaker: Ø40mm 4Ω full frequency loudspeaker inside the magnetic

 SNR:> 95db

 Sensitivity: 90db

 Presentation Material: Pure ABS materials;

 Audio ports: 3.5mm plugs activities

 Built-in lithium: 3.7V200mA

 Charging: USB computer charger charging or charging DC5V200mA product specifications: diameter 4cm Digital Power Amplifier