1. This product is suitable for all models with air source device. 2. The working current of the control relay must be greater than 10A. 3. The cross-section of the main power line of the relay is greater than or equal to 2.5MM2. The output line is not less than 1.5MM2. The negative ground wire should be in good contact to ensure the use effect. 4. The air source of the horn should be directly introduced from the air storage cylinder to achieve better sound quality: the air storage cylinder must discharge water frequently to affect the service life of the solenoid valve. 5. Working pressure 0.3~0.9MPa, Jiazhi 0.42~0.68MPa. 6. The temperature adaptation range is -40~80. Specification: Supply voltage: 12/24 (V) Current: 10A Sound level: 110 (db) Approx. Caliber: 60MM Applicable models: Universal