Specification: 1.Bluetooth version:2.1+EDR 2.Codec:SBC 3.Voltage: 220 V 4.Maximum power: 50W 5.Impedance: 4 () 6.Loudspeaker unit: 133(mm) 7.Sensitivity: 200 hv 8.Frequency response range: 20-20000 Package included: 1X Car Bluetooth Amplifier 1X remote control 1X AC power line 1X DC power line 1X speaker connecting line Dear buyers, we appreciate your business, if you are satisfied with our service, please leave us a positive feedback and rate the details of the transaction (Detailed Seller Ratings) with a ''PERFECT 5 STARS''. If you have any problems, broken, quality problems, please don't worry, and don't leave bad feedback. Please send us an email first, we will reply you as soon as possible, please allow us to respond within 12 hours. We understand your mood, and will provide you with the best solution for your problem, please give us the opportunity to solve the problem, For any case,please feel free to come to us,we are always here. look forward to and thank you for your trust.