More Details: Features: Full aluminium alloy material、 cool and special appearance.  Dual 5W speaker、 make sound more cool and shock. AUX line-in. Your phone still can connect to speaker without Bluetooth function. Built-in 2000mAh battery. Long time to listen to music. Just touch the speaker's NFC area with your phone、 then connect to speaker. Adjust volume and switch songs easily. Specifications:          General Specification             Brand Name        OVEVO             Model Number        Z4             Color        Silver             Net Weight (kg)        0.776kg             Gross Weight(Kg)        1.114kg             Product Dimensions (cm)        7.5*7.5*20cm             Main Material        Aluminium alloy           Technical Parameters             Bluetooth Version        V4.0 (CSR8635)             Support Protocol        HSP\/HFP\/A2DP\/AVRCP             Transmission Distance        10m             Charging Voltage        DC 5V; 1000mA             Charging Time        About 4 hours             Music Time        About 10 hours             Output Power         5W*2             Frequency Response        20Hz-20kHz             Speaker Diameter        50mm             Impedance        4Ω             NFC Function        Yes            MFB Button        Change the music mode、 like pop、 light music、 etc            EQ Button        Pause\/play music    Package  Included:                  1 X OVEVO Z4 Bluetooth Speaker            1 X Charging Cable            1 X English Manual