Features: 1. Subwoofer effect 2. High quality speakers 3. Power failure memory function 4. Comes with power amplifier 5. Bluetooth 4.0 wireless connection 6. Metal mesh cover 7. Clear sound quality 8. High quality magnet 9.ABS material 10. Coaxial fixed resistance Specification: Model: K-916 Product Name: Coaxial fixed resistance speaker Voltage: AC 110-230V Bluetooth distance: ≤10M Power: 2*40W Impedance: 8Ω Ambient temperature: -20 ° C ~ 45 ° C Sensitivity: 92±3dB Frequency response: 90Hz-18KHz Speaker: 25/135MM Appearance size: 190*110MM Opening size: 165MM Material: ABS Package included: 1x speaker