1. Speaker impedance: 4-8 ohms 2. Speaker power: 10-50W 3. Input current: 3A 4. Input voltage: 9-24V 5. Function: Support Wuzhi Audio App 6. Audio input: BT+AUX+USB+USB sound card 7. Power output: 15W+15W+30W 8. Number of channels: 2.1 9. Protection mechanism: overcurrent, overheating, short circuit, anti-static protection 10. Dimensions: 76 x 60 x 22mm 11. Weight: about 102G 12. Note: 24V battery cannot be used for power supply, because the full voltage of the battery will be around 28V