1) Descriptions: 1. Auto switching function 2. Detached two way design. 3. With "Aux in" function 4. Adopt with microchip control circuit design 5. Built-in two 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: -40 to 55 degree centigrade 9. Siren Tones: 9 types 10. Mounting Method: Handle design 11. Product Dimension: 210L*188W*61H 12. N.W:2.6kg G.W:3.12kg 13. QTY/CTN: 10Pcs.