1) Descriptions: 1. Low profile design, 2. Detached two way design. 3. With "Aux in" function 4. Auto switching function 5. Built-in four way large power controller. 6.Speaker can be purchased separately 7. ODM/OEM orders are welcome 2) Parameter: 1. Input Voltage:12DCV 2. Current Draw:less than 5mA 3. Input Current:20A 4. Output Power: 300W 5. Output Depedence: 11Ohms*2 (2pcs of large power speakers) 6. Audio frequence distort: less than 10% 7. Siren Audio frequence:500HZ-1850HZ 8. Operating Temperature: Minus 40℃ to 55℃ 9. Siren Tones: 6types 10. Mounting Method: Handle design 11. N.W:2.6kg G.W:3.12kg 12. QTY/CTN: 10Pcs.